Tag hag is a woman who will only wear clothing that is hideously expensive and bears the 'right' tag or label in the belief that she (it is mostly she) is a better person for doing so. 

“标签女”指的是只穿那些贵得令人咋舌的衣服，只认准名牌标签的女人。她们认为穿了名牌衣服自己就变成了更优秀的人（基本上也只有她们自己这么认为）。

Example:

She's such a tag hag. She wanted to wear my Versace even though she hates it!

她真是个“标签女”。尽管她不喜欢我那件范思哲的衣服，她还是想借去穿。