tshirt sizing

i’m wanting to buy a shirt on gmm’s website but am unsure about sizing because i know their stuff tends to fit small. i looked at the sizing chart and it matches the same size i wear in comfort colors. a large in comfort colors is perfect (which is supposedly the same size as the large on the website) but i don’t want to buy the wrong size and return. just wondering what size yall usually buy from them compared to what you usually wear. someone told me to get a 2x vs my usual large because of how small they fit😅