I always thought black was cool, but these ran just a little tighter around the legs and waist than my earlier set (not black).  I bought some more pastels, and they fit just fine though they are the same size.  Go figure.  I wear them on a limited basis, like when I'm dressed up and active.  I think the elastic was overstretched when sewn.  Ah, well, the material is great and they are still better than others at keeping cool.  I will not likely order black again.