Herman, fit is definitely very relaxed, and I got the slim fit. Based on measurements, I should have snagged a large, but I sized down one size with the intent of wearing it over blazers/knit layers/etc.
If you wanted to wear it with just a shirt underneath, I would suggest sizing down two sizes.
Quality is incredible, and the details are all spot on. It’s a very legitimate piece of clothing. I’ll be talking about it more in the coming weeks.