Size small, has stretch- I’m really trying had to find both colors in med. the small is to short waisted on me but med fits perfectly- these are sold as set, or can be sold separately -in like new condition- no stains, no issues. In excellent shape. I lost 50 lbs and thought maybe a small would work, it almost does. Just not quite. Adorable under shirts or my favorite under ripped up jeans. These are super comfortable and breathable- like NEW -