Technical flat drawn to scale from the size chart.
J501
High rise and a loose, straight leg: Japan Blue's roomiest classic cut.
For a 81.3 cm waist (our default: enter yours). Size 31’s waistband measures 81.3 cm, right at your waist. Selvedge gives about an inch with wear, so a waistband that starts at your waist ends up comfortable, not loose.
- Maker’s fit name
- Loose
- Fabric
- 14.8oz US cotton selvedge
- Weight
- 14.8 oz
- Maker
- Kojima, Okayama
- Shrinkage & finish
- Sanforized, one-washed Hemming and cuffing guide
Order size 31 for a 81.3 cm waist, and check the seller’s own chart before you buy. Menjitsu may earn a commission when you buy through these links. It never changes your price or which jeans we chart.
Measured profile
at size 31- Rise
- high
- Thigh
- roomy
- Taper
- strong
- Opening
- medium
| TAG | 29 | 30 | 31 | 32 | 33 | 34 | 36 | 38 |
|---|---|---|---|---|---|---|---|---|
| Waist | 76.2 | 78.7 | 81.3 | 83.8 | 86.4 | 88.9 | 91.4 | 96.5 |
| Front rise | 30.5 | 31.8 | 32.4 | 32.4 | 33.7 | 34.9 | 34.9 | 36.2 |
| Back rise | 42.5 | 43.2 | 43.2 | 43.8 | 45.1 | 45.7 | 46.4 | 49.5 |
| Thigh | 33.7 | 33.7 | 34.9 | 35.6 | 36.2 | 36.8 | 38.1 | 40 |
| Knee | 24.1 | 24.1 | 25.4 | 26 | 26 | 26.7 | 27.3 | 28.6 |
| Leg opening | 20.3 | 21 | 21.6 | 21.6 | 22.2 | 23.5 | 24.1 | 24.8 |
| Inseam | 81.3 | 81.3 | 81.3 | 81.3 | 81.3 | 81.3 | 81.3 | 81.3 |
Centimetres; thigh, knee and opening are measured flat. Transcribed from Rivet & Hide (published in inches). Retailers measure differently; confirm with the seller before you buy.
Compare with another model
Quick picks: TCB Baggy 50's Graph Zero GZ-15HRJ Big John S1950WS
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Cut close to the J501
The nearest matches by rise, thigh, knee and opening at size 31, from any maker.
Baggy 50's
広Wide- Rise cm
- 31.5
- Thigh
- 36
- Knee
- —
- Hem
- 22.8
GZ-15HRJ
広Wide- Rise cm
- 32.5
- Thigh
- 34
- Knee
- 27
- Hem
- 24
S1950WS
広Wide- Rise cm
- 31.5
- Thigh
- 34.2
- Knee
- —
- Hem
- 23.5
34
広Wide- Rise cm
- 31.1
- Thigh
- 32.4
- Knee
- 24.8
- Hem
- 22.9