Tom at Iron Heart The Works, in Hachioji is the measuring expert (amongst many other things), She says the best way to sort your sizing out is as follows:
Measure a pair of jeans that fit you well, using Toms instructions below.
Then compare with the measurements of the jeans you are considering. The sizing charts are on every product page under the "sizing" tab, which is to the right of the "description" tab....HOW TO MEASURE BOTTOMS
Do not go by tag size alone, we suggest you take a pair of jeans/bottoms that fit you well and measure them and then compare with measurements on our product pages to get your sizing correct.Waist
: button the top button on the jeans/trousers, and pull them so that they sit flat in order to measure from centre of back to front closure, then double this measurement.Front Rise
: measure from the central crotch seam to the top of the front waistband.Rear Rise
: measure from the central crotch seam to the top of the rear waistband.Thigh
: lay the jeans flat ensuring that any rear rise fabric is to the left of the centre seam and measure the TOTAL width (not just to the centre seam) ensuring that the measuring tape is at right angles to the weft (white) yarns (for denim).Knee
: measure 13” down the inseam from the central crotch seam, at this point measure across the width of the leg.Hem (or Cuff)
: with the leg side seams together, measure the width of the leg opening.Inseam
: measure down the inseam of the leg from the central crotch seam to the bottom of the leg.