JNR PANTS

These are the Japanese National Railways (JNR) work pants, commonly known as "nappa-fuku," that form a set with the jacket mentioned previously. If the upper body was "gear to operate trains," what was the lower body for?

Upon closer inspection, they revealed "unique Japanese design principles" even more strongly than the jacket. For instance, the waist is secured with a self-fabric drawstring instead of a leather belt. This detail was also seen in the military breeches (gunko) of the former Imperial Japanese Army, a remnant from an era when leather and metal fittings like buckles were scarce, and also a reflection of traditional Japanese clothing wisdom to "fit all body types." Material considerations and cultural considerations coexist within the same single drawstring.

And another point: just like the jacket, there's a "watch pocket" on the right front. The dedication to punctuality extended not only to the upper body but also to the lower. It truly seems the entire garment was designed as a single component integrated into the railway system.

Once again, this was a piece that made me want to delve deeper the more I disassembled it.

The reason for recessed buttons — reversed fly closure

What first surprised me was the front closure specification.

Typically, for a pants fly, buttonholes are on the top fly and buttons on the underfly (extension side). However, these pants completely reverse that convention. Buttonholes are made on the underfly, and conversely, buttons are sewn onto the "back" of the top fly.

Why this deliberate reversal?

It was probably a design to avoid having any protruding objects like buttons on the outer surface. The aim was to prevent snags in narrow, equipment-dense engine rooms, contact damage with levers or other protrusions, and the detachment of accessories as much as possible.

Initially, I thought, "If they just wanted to hide them, they could use a standard fly front with buttonholes on the inside of the top fly." But a fly front that closes tightly would make them difficult to put on and take off. This design aims to have nothing protruding on the outside while being easy to fasten smoothly. Considering it as an idea conceived to achieve both, it's a detail that invites deeper interpretation.

Incidentally, the pants have only two pockets: a watch pocket on the right front and a patch pocket with a flap on the right back. This surprised me personally. I imagine it's a division of labor between top and bottom, where the jacket provides ample storage, while the pants, which allow for more movement, are given only the bare minimum of storage to avoid hindering activity.

The necessity of matching watch pockets on top and bottom — a pattern for the Seiko Type-19

As mentioned in the JACKET article, JNR adopted the "Seiko 19-type (Type-19)" as its official railway watch. According to Seiko's official archives, the Type-19 was released in April 1929, and adopted by the Ministry of Railways (JNR's predecessor) in November of the same year. Production ended in November 1971. It was literally the "official watch" that operated Japan's railways for over 40 years.

For railway workers whose mission was punctual operation, a watch was not just a tool. It was part of their body, and even the shape of the storage pocket was designed to shave off fractions of a second.

Although there may be individual variations in the size and shape of this pants' watch pocket, the curve of the bottom and the sewing specifications of the opening seem to be almost identical to those of the JACKET's pocket.
It's highly plausible that when issued as a set, the "pocket patterns" and "sewing templates" were shared for efficiency.

If they were issued as a set, using the same pattern would be faster than creating a separate one. This is a very natural decision, but the fact that it remains in the details is what I find appealing.

The back pockets are patch pockets with flaps, secured with buttons, and have firmly attached pocket bags inside.

The button placement and how the flap is finished show commonalities with the chest pocket flaps on the jacket.

The cleverness of the U-shaped topstitching — the crotch reinforcement fabric reveals the sewing order

On the inside of the crotch, a rectangular "reinforcement fabric" is carefully attached.

I believe this is a specification serving two purposes. One is to reduce the "bulk" where the four seam allowances converge, making it more comfortable against the skin. The other is to physically reinforce the crotch, which is most prone to tearing during movement. It's a balance of practicality and comfort.

What I want to delve into here is the sewing method.

If you look closely, no stitching is visible on the edge of the fly (placket) side. At first, I thought they simply forgot to stitch it. But that's not it. It's not that it wasn't stitched down, but rather it was sewn in with the seam allowance during the initial "plain sewing" stage. After that, the fabric is folded back, and the remaining three sides are topstitched in a "U-shape." In other words, the sequence of processes is plain sewing → folding back → U-shaped topstitching.

It's a small ingenuity hidden in the sequence of processes that might seem overlooked at first glance. In "Fuku o Horu" (Digging into Clothes), these are precisely the details that pique my interest.

Incidentally, the side and inseam are finished with an overlock stitch, just like the JACKET. The seam allowance width is 1cm. I can't help but react to such subtle differences, whether it's 1.0 or 1.2. It's an occupational hazard.

Why the belt loops are placed lower than the top edge — structural strength to dissipate force

My attention was drawn to the belt loops being attached one step lower than the top edge of the waist.

Upon observation, the bottom is securely reinforced with backstitching (similar to a bartack), but the top is attached with "plain sewing," meaning no stitching is visible on the outside. Let's put aside the idea of dismissing this as merely a design detail for now.

When worn, loops are parts that are constantly subjected to "upward" stress by a belt (or, in the case of these pants, a drawstring). If the top edge were topstitched from the surface, it would be strong at that point. However, in the worst-case scenario, there's a risk of the fabric tearing along with it.

In contrast, with this "plain-sewn-in" specification, because the loop itself is attached to extend upwards, the pulling force seems to dissipate and spread into the depth of the seam allowance.

It would be interesting if this was the result of the designer's decision at the sewing machine, choosing between "physical strength due to thickness (point strength)" and "structural strength that dissipates force (dispersion strength)." These are the kinds of details that really captivate me.

The uncompromising decision not to use selvedge on the side seams — prioritizing yield and the body

The "facing" sewn on the inside of the waistband is a perfectly straight, rectangular piece with no curves.

Naturally, its dimensions and shape don't match the waistband of the main body. It's evident that tucks are used to forcefully, yet rationally, adjust for this difference.

What's particularly noteworthy here is the fact that both ends of this facing had selvedges. Both ends selvedged. This indicates that this piece was cut to the full width of the original fabric roll at the time.

Looking at the image, the excess fabric is neatly folded up into a tuck. At first glance, it might seem like "ease" intended to allow for later waist size adjustment. However, if that were the case, the seam allowance at the back center of the main body, which would also need adjustment, should be equally wide. But the seam allowance on this particular garment was a uniform 1cm.

This suggests that this tuck isn't a functional adjuster, but rather the result of extreme "yield (efficiency) prioritization," where the excess fabric from cutting to the full fabric width was simply gathered and processed.

And one more thing that this selvedge use tells us. It's the high probability that wide selvedge fabric was used at the time. Wide selvedge. This alone gives us a faint glimpse into the fabric procurement situation of that era.

Why the drawstring exits lower than the top edge — the answer emerged after a day of wearing

My attention was also drawn to the structure of the waist drawstring itself.

It has a very special construction, appearing almost like a knitted fabric. While searching within the scope of what's available in the modern market, I couldn't find similar materials, and suppliers told me it would "have to be custom-made."

And the fact that both the drawstring opening and the belt loops are set lower than the top edge of the waist. I found my own answer to this intention by actually wearing these pants for a day.

With a drawstring adjustment, as you move and change posture, the part of the drawstring not fixed by loops gradually creeps upwards. If the loops and drawstring were placed closer to the very top edge, the drawstring would frequently pop out from the edge of the pants and dig directly into the body.

By intentionally lowering the position, the drawstring is controlled to always remain "above the fabric." This unique positioning, I realized, was not a design quirk but a necessary consequence for continued use as a tool.

No one explains this in literature. You only understand it by wearing and moving. This is where I feel the evidence remains that these pants were a "thoughtfully designed tool."

Historical context: Wisdom of Japanese clothing and post-war materials

Here, I'd like to briefly look at the historical background in which these pants were created.

JNR (Japanese National Railways) existed as Japan's national railway organization for 38 years from 1949 to 1987 (Source: Wikipedia "Japanese National Railways").
With privatization in 1987 (split into various JR companies), the nappa-fuku also fulfilled its role. While the exact manufacturing date of this particular item cannot be determined, it was probably issued sometime within those 38 years — perhaps during the transition period from steam locomotives to electric trains.

The design of securing the waist with a drawstring also has an interesting origin. The former Imperial Japanese Army's Type-98 military breeches (gunko), formally adopted in 1938, featured drawstrings at the waist and ankles (Source: paratrooper.fr military archive). In an era when leather and metal fittings like buckles were scarce, traditional Japanese drawstring closures were also adapted for military uniforms. It's highly possible that this specification flowed into railway workwear after the war — though this cannot be definitively stated, so please consider it as one theory.

And the "Seiko Type-19" mentioned at the beginning. According to Seiko's official archives, it was released in April 1929 and officially adopted by the Ministry of Railways (JNR's predecessor) in November of the same year. This was the first case of a domestic watch being officially adopted by a Japanese government agency; until then, they relied on imported watches like Waltham, Elgin, Omega, and Zenith. It operated Japan's railways for approximately 40 years until production ended in November 1971. The watch pocket on these pants is designed as an "optimized receptacle" for that watch.

Technology, materials, and culture are intertwined within a single pair of pants.

Clothing as a tool

Laying out the disassembled parts, it can be seen that the side seams are not straight but form a gentle curve.

In the context of vintage denim, it's common practice to make the side seams straight, use the selvedge, and save on production efficiency and fabric waste. However, these pants, despite being made of selvedge fabric, choose not to use the selvedge on the side seams, opting instead for a curved cut (overlock finish).

This is the result of prioritizing "a silhouette that conforms to the body" over "using the selvedge," and that clear-cut decision is good.

...No, perhaps trying to find meaning in intentionally not using the selvedge is a bias of mine, an occupational hazard from being too involved with the symbolism of selvedge denim.

The reversed button placement. The shared patterns for top and bottom. The U-shaped topstitching sequence. The plain-sewn-in loops. The decision not to use selvedge on the side seams despite having it. The necessity of the drawstring's position.

Each detail reflects the maker's judgment, the wearer's body sensation on site, and the material circumstances of the time. These weren't choices made for design; they were all choices made out of a "reason to function."

These pants were indeed a "tool," not an ornament. They were designed to ensure the railway system ran smoothly and not to impede human movement.

Just being able to touch upon that philosophy made this enjoyable again!!

* This article is based on observations of a single garment, and there may be individual differences in age and specifications. Also, some parts of the historical background include speculation due to limitations in records, which are explicitly stated as "one theory."

That concludes the JNR PANTS.