I have had these problems for years. I cannot stand anything that is tight. It causes nerve pain. If I even try on a pair of pants in the store, and it is not really loose, it will trigger pain that will last for days. And I cannot stand anything binding on my midriff or abdomen. Many leggings and yoga pants have a seam across the middle of the abdomen, where they squeeze you to give a smooth look. That seam causes me extreme pain. It is almost impossible to find pants that stay up but do not cause nerve pain. And vaginal pain from the seams of pants is a terrible problem. I have IBS, interstitial cystitis, and vulvadynia, all of which are related. It is likely a nerve mediated disorder that affects all these areas and causes pain, and intestinal symptoms. I try to wear lightweight, stretchy pants or skirts that do not squeeze too much. And shirts/blouses that are not tight fitting or need to be tucked in, which causes further restriction. Try to find leggings that do not have thick waste bands or suck you in to create a smooth look. it is very difficult, since I am an attorney and need professional clothing. It is a constant problem.