boiler suit
noun [ C ] mainly UK uk/ˈbɔɪ.lə ˌsuːt/ us/ˈbɔɪ.lɚ ˌsuːt/ (US usually coveralls)
（做脏活儿的）连衫裤工作服
a piece of clothing that covers both the upper and lower parts of the body and is worn especially over other clothes to protect them