Jackets tend to fit a size smaller than your shirt size (North America Buyers). 

An easy trick is going ONE SIZE UP from your fitted shirt size. This works for about 90 percent of our customers, but we still recommend you check the chart below. 

On a product page "Relaxed, or Fitted" icon is shown, meaning the jacket style will fit relaxed/form fitted around the body. We are still a Euro sized brand.

If you feel the jacket will be a little tight, that can be good! Real leather will relax up to a couple inches around the body with some wear.
Over time it will mold to you, giving you a new second skin

For Custom Tailoring Visit: www.lucajackets.com/pages/custom-sizing

Luca Designs Size Chart

Go with the closest fit based on your measurements and consider if you want a snug or relaxed fit.