Men's Cotton Lightweight Slim Fit Jacket Casual Wear

I'm 25 years old guy, i usually wear us s. i'm 41 chest, 17,7 shoulder. what size should i choose?

Would this look good on a guy with a muscular build? From the pics I feel like it's for skinny guys

Does it keep you warm on a spring night?

I'm 6'1 and 143 lbs what size should I get *ps. I'm really slim*