I ride in t-shirts and stretch jeans. I LOVE the sort of snug-fitting stretch jeans, because they don't ride up like looser jeans can. The only bad part is that they can get tore-up out on the trail. Which is why I sometimes ride in chinks. But not in the middle of summer when it's hot. The rest of the year chinks are great for saving my jeans!
I wear a troxel helmet but also ride in tennis shoes. I can't help but think a boot would keep my foot in the stirrup if I fell because my foot wouldn't come out as readily. Backwards from normal thinking I know! But my tennis shoes are really loose and fall off easy and I don't think boots would.
So yeah, t-shirts, stretch jeans, chinks, helmet, tennis shoes, lol!
Oh, and I also like underwear with a little stretch in them too, and really flat elastic that doesn't rub.
I was so happy the other day that I tried on some new jeans and fit into a size 18! (I used to be a size 24, so 18 is a big improvement!)