Most Breathable Leggings/Bottoms

I always get SO hot during class! I don’t think that the room is necessarily too hot because it is comfortable during warm up but I think with so many people working out in one room it is inevitably going to get warm and I am very sensitive to temperature. I really wish I could wear bike shorts but obviously that is not allowed so I am looking for whatever leggings or bottoms that will keep me the most cool but are still appropriate for barre. Thank you all!!