Niepce IncStreetwear Men's Techwear Pants with Straps

I'm 5'5 and weigh 155lbs, I'm confused by the reviews as to which size should I get in these pants. Help?

5'10 240lbs 38w 29length?

My son is very skinny and tall… about 6’2 and 125 lbs. Will a medium be long enough? Waist is about a 29 in young mens…

I’m 5’7 weight 184lbs usually wear waist 32 what size should I get?