Street clothes get dirty, have too many loops, pockets and fasteners and ride up at the waist. Overalls have none of these disadvantages and if you buy disposable you can bin them when you're finished.

Portwest S999 Men's Work Coveralls - Protective Polycotton Work Overalls Durable Workwear Boiler Suit for Mechanics Warehouse Garages DIY Navy, Large
4.0

Turners Mens Work Overalls Coveralls Boilersuit Navy - Warehouse Garages Students workerwear Suit
4.0