loincloth
US
UK loincloth n: (cloth covering genitals)
SC （男子用以蔽体的）缠腰带 nán zǐ yòng yǐ bì tǐ de chán yāo dài
SC 缠腰布 nán zǐ yòng yǐ bì tǐ de chán yāo dài，chán yāo bù
Instead of wearing a proper swimsuit, the strange man wore a loincloth to the beach.