罗老师的看法很对，我补充几个例句如下：

The shop specializes in designer beers. 这家店专卖名牌啤酒。

He was wearing expensive designer gear.  他穿着昂贵的品牌服装。

Fake designer watches are sold at a fraction of the price of the genuine article. 假的标名手表以远低于真品的价格出售。

The little black designer dress had been an impulse buy. 这条著名设计师设计的黑色小裙子是心血来潮买的。

Wearing designer clothes is a matter of personal prestige for many teenagers. 穿名牌服装对许多青少年来说是关乎个人身分的大事。

designer可以用作形容词，且为定语形容词，即只用于名词前作定语，意思是“由著名设计师设计的”“标有设计师姓名的”“名牌的”。