Not all wetsuits are created equal. Different brands make different models in different shapes which eventually means that an M sized wetsuit from one brand can be designed for a differently shaped human body as the wetsuit from another brand with the same M size label.
If M from brand A fits you perfectly it doesn’t mean all M sizes from all the companies that make wetsuits will fit you perfectly. So here you have a collection of size charts from all the brands that we could find directly from the manufacturers. It is the next best thing after trying the wetsuit.
If you are a beginner I also suggest that you read my explanation of wetsuit sizes (like what the hell is an MT and who fits into XXXL) and a few tips on buying your wetsuit online which of course means you are not able to try it.
Quintana Roo Wetsuits