Equissentials make custom breeches that fit (and they’ll take 'em in for free if/when you lose weight).
The non-custom that have fit me the best are Tropical Rider (their winter tights are the absolute best and no “orange peel”). Both of these companies have stellar customer service (I order directlky from them, and not via the catalogs).
I was less impressed with Saddle Bums. Good customer service, the material is cool and, um, concealing in teh “spandura” fabric, but they just don’t fit me as well as the Tropical Rider winter ones or “Enduracool” summer ones. I have a fairly small waist, but huge butt and thights. I’ve found that the lowrise TRs are very flattering on me, and have my Equissentials made with a lower rise (not super low, just not as armpit-high as most companies seem to think we all want them) too.
The justchaps.us link has intrigued me, but the XXLs are really short compared to the other sizes, and I am not. But I would dearly love a pair of fringed half chaps.
Right now I have a pair of Ariat All arounds that I’ve had for years and that have stretched out so that they slide down if I’m in tights, but new ones are pretty darn tight if I can get them to fit at all. (Curse my athletic high school and college days!)