The hotel gift shop sells cotton undershirts for guests who forgot to pack extra clothes.

飯店禮品店販售純棉背心，提供給忘了多帶衣服的房客。

Our new uniform policy asks staff to wear a plain white undershirt beneath their work shirts.

我們新的制服規定要求員工在工作襯衫裡面穿一件素白色背心。

The customer called to return a box of undershirts because the shipment arrived in the wrong size.

這位顧客來電要退回一箱汗衫，因為送到的貨尺寸錯了。