I ordered a size too small--returned. Larger size was out of stock, so I ordered the Flight pants. Flash pants would have fit most of my needs, but would be better with a zip fly if worn under other garments (same for flight pants). I don't think that would be an issue with unisex sizing in M & L--greater convenience for men, not inconvenient for women.
This review was written in the old system and had content requirements that are different than reviews written today.