I'm 5'7" and around 142 lbs, depending on the day.

I can wear anything from a size 4 up to a size 8 usually in women's work/casual wear. I need a large or XL in Zoot tri clothes. Yup, it's crazy. I now keep all my measurements on a card and use that to check the sizing before buying on-line. Even then I get into trouble, sugoi's tops are usually too short for my torso and many shorts fit me well in the waist and butt while they cut into me on the leg openings. Arrrrrrgggggg!!