This is a denim coverall from Big Mac. It is a dark blue, heavy (though not stiff) denim and there are thick pads that run from the knee to the bottom hem. The coveralls do not have their original tag so I don't know the actual size though some measurements follow to help with fit.
The cheapest cuff of the sleeves have hidden buttons for safety. It has a metal zipper and snaps at the front and elastic at the back of the waist. There are a lot of pockets including those at the sides like you find on painter's pants.
I don't see any meaningful signs of wear and the coveralls are in very good condition.
21 inch waist laid flat
26 inch sleeves from the top shoulder seam
27 inch inseam
20 inches across the back at the sleeve seam
37 inches from the crotch seam to the collar seam
26 inches armpit to armpit
Product code: Big cheapest Mac denim coveralls with padded calves Size XL