牛津辞典中有fashionable clothes这种说法。而fashion，则是这么用的：dressed in the latest fashion 装扮入时的 Fashions for men's clothes change less frequently than fashions for women's clothes.男装的时样不如女装的时样多变化。（摘自牛津辞典）可见不用fashion clothes.

fashion clothes 更常见

时尚服装

最好还是说 ： fashion apparel

fashionable dress

仅供参考。

第一个更加常见。