Actually, there's something I'd pay $20 for.
I mail you a list of measurements. You mail me a list of brands and styles that fit.
I mail you a list of measurements. You mail me a list of brands and styles that fit.
Like for example, 32-waist Wrangler seems to be equivalent to 30-waist Gap. Only way I know this is because I tried on the jeans at the mall and found those to be the most comfortable on me.
The variation is strange and it's not just pants but also shoes sizes aren't consistent between brands either. I think the way Zappos solves this is they send you the shoes and you send them back if they don't fit well.
There would need to be some brand research done, checking the fitting and sizing of various brands, so you could know that "with a 31 inch waist, measured around the navel, I would fit in 30 inch Gap jeans and 32 inch Wranglers."
That trip to try on those two pairs of jeans cost you what, an hour? two hours?