LDNINEMen's Relaxed Vintage 60s 70s Bell Bottom Stretch Fit Classic Comfort Flared Flares Retro Leg Disco Denim Jeans Pants

I usually wear 40” in the waist, which is extra large here in USA sizing. What size do you recommend? These are pretty stretchy, correct?

Can you wear a belt with them

I wear a 33-34 inch waist by 34 in length. What size do I order?

My us size 36x 36, so if i get xl its fine for me?.