BULLIANTStretch Belt Men,Mens Gift Woven Braided Web Belt 1 3/8 for Golf Casual Pants Shirts Jeans

I have a 40 “ waist. What size belt do I need.

I have 36" waist, What size belt should I order so it will streach just a couple of inches past the first pant noose/loop?

What size in inches corresponds to XL?

Ordered twice. one set marked 37 on flap opposite buckle. too small. next set marked 45 too large. ordered initially 38-42 size. have 39-40 waist. ??