For questions about size see the following two tables. (Table 1 – Streetwear) (Table 2 – Cycling Apparel)
STREET WEAR: In street clothes the fit of the clothes is normal, that is, if you use M take M.
CYCLING APPAREL: In cycling clothing, the cut is very similar to casual. Unless you like to dress very tight, take a size less (more race). If you like to go wide, take one more size.