I was looking for a two-piece track suit that I could also wear on the street. I bought the RST TRACTECH EVO R Jacket and pants. They had all the safety features I was looking for at an unbelievable price. I'm 5'7" 165lbs 39" chest, 30" waist. The 40 Jacket fits great with more of a race fit. I had tried on a Dianese Laguna Seca two-piece and the quality and finish of the RST is ever bit the equal. The RST suit was $500 less than the Dianese suit! Incredible value for money. I could not be happier with the fit and quality of the RST gear. Kudos to SBTG for helping me decide between a 38 or 40. The 40 is spot on.