I purchased a sleeveless cycling top (men's medium, club cut) in the last Champion Systems gear order. It looks great, but it's too big. For whatever reason, it's much bigger than my medium cycling top from Champion Systems that has sleeves. It would probably fit you if you would normally buy a large.
It's brand new and the tag is still attached, never worn except to try it on. I'm willing to swap for a men's size small of the sleeveless cycling top, or sell it otherwise. It cost $50, but I'd sell it for $40 plus whatever it costs me to ship USPS (unless you want to meet up).
Wonder if it would fit me... I'm 5' 11" and 168 lbs.
Probably a bit too small for you... I'm 5'8'' and 145 lbs, and I'd guess it would fit someone best if they are in between us.