Yếm

A yếm or áo yếm (Vietnamese: [ʔiəm˧˦], chữ Nôm: 裺 or 襖裺) is a traditional Vietnamese undergarment that was once worn by Vietnamese women across all classes. It was most usually worn underneath a blouse or mantle to preserve modesty.

It is a simple garment with many variations from its basic form, which is a simple, usually diamond or square-cut piece of cloth draped over a woman's chest with strings to tie at the neck and back.