a confirmed clothes horse

a confirmed clothes horse 我在shanghai daily 上看到一段话,如下:The problem for the 22-year-old is that though she's a confirmed clothes horse and a shopaholic,she also has that thrift gene.其中a confirmed clothes horse 怎么翻译,大概的意思我明白,应该是指她比较注重穿着,那也是我猜的,它属于习惯用语吗.准确的意思是什么首先，我想知道的是a confirmed clothes horse 这个词组在英语中确实存在的，还是作者自编的，如果确实是英语中存在的，那它通常在什么情况下使用，表达的是一种什么样的意思