I have a hard time fitting comfortably into ANY Pearl Izumi jerseys. Even their XL's tend to feel snug on me. Yet I easily own about 8 pairs of PI shorts and tights...the majority in M, and 1 pair (their Thermal Elite tight) in L. I'm not particularly big-busted (38C), so I'm not really sure why their tops never seem to fit me well. Perhaps it's my wider lats (from years of weight lifting and swimming) that are causing the fit issues.

Linda