Daft question; 70 plate seatbelt too short, worth buying an

i Wish I had a bit of a podgy belly , since I’ve had diabetis I’ve lost over 2 stone & I’m just bones , I’d far rather a seat belt didn’t do up that spending my days pulling my pants / trousers up , I’m in small pant & there still to big , mrs suggested kids , what some shop assistant would think to a 59 yr old bloke buying kiddies pants I don’t know
Actually op I think if you only problem is a lorry seat belt will not do up you’ve not got a lot to complain about , think yourself lucky ,