This shirt is made of smooth broadcloth, which feels very comfortable.

broadcloth 是由 broad（宽的）和 cloth（布料）组成的复合词，字面意思是"宽幅布料"。在纺织业中指一种质地细密、表面光滑的平纹棉布或棉混纺布料，中文称为"细平布"或"阔幅布"。