Like whodini said, Baggy Bjorn. I had a pair of these. They are very relaxed through the thigh. They've been discontinued, but mynudies in particular have quite a few floating around in the buy and sell forum at reasonable prices. I'd buy another pair if I could find a 33 waist. A 36 BB should give you about 30 inches in the thigh.
Studio D'artisan, some PBJ, some Sugar Cane, some Samurai. Regarding these, just look at the fit guide on BiG. The SDA's in particular strike me as especially roomy in the thighs. I don't own a pair, but from what I've seen on BiG they have roomy thighs and low rises.
Nudie Regular Ralf is not nearly as slim as you might expect from a bootcut: a 26-27 inch thigh on a 36 waist is quite substantial. The Nudie Even Steven is pretty roomy to.
The Academi jean is roomy in the thigh--the grey (or blue?, can't remember) one at least. I did not like the cut at all, but the thigh was not an issue. I tried them on at Urban Outfitters.
There's alot of shit out there.