I would accept that it was my fault not to do enough research and forgetting that every brand has their own size chart.
Having said that, the product itself is an excellent quality. 5 star on the details and the quality
Size chart is kind of misleading. I normally wear L or XL (on SIMMS) and thought this would fit perfectly but you can fit 2 of me in this one.
Please order at least 1 size smaller than what you normally wear. The sizes are similar to the Colombia Shirts sizes.