Wonderful Bottoms by Isis!!!
The small was a perfect fit for a size 4-6 and they are even reversible!!! Can be worn with almost anything and kept me warm in below freezing temperatures with just a skirt on. Waist is wide enough that it does not dig into you and the fabric stretches always moving with you. Doesn't get baggy after repeated usage and resists stains. Again, they are reversible!!! :-)

Really like the fabric and texture
Very comfortable. Great to wear as a base layer. I found the bottom to be a little long. I am 5'4 and ordered a small.

Excellent fit!
Excellent fit! Great to wear even under dress pants. The waist band design is very different from other long john styles and fits sleek around the waist in sort of a high rise style and does not bunch or bind. These can be worn under leggings or tight ski pants to give extra insulation and not bulk. Only complaint is about the actual material which overall is very pleasing but snags easily. The matching top both crew neck and mock can be purchased separately and may be worn as a stand alone piece or layered. Again, watch for snagging but overall this top looks great on with a nice comfortable sleek fit. Not the usual long john look or fit, again, no bulk! It is about time someone designed long under wear for women with fashion and functional fit! And yes, they do keep you warm and really breath. They also wash up well, just make sure you put them in a laundry mesh bag so they do not get snagged in the washing process or simply wash separately. Watch velcro tabs on your other pieces of clothing because they can really snag this material. This product sizes true and a small fits a size 4 to 6 properly with no baggy spots.