可以用 "A hairstypst's attire is fashionable" 来表达理发师的衣服很时髦。
"Attire" 是衣着、服装的意思，"fashionable" 是时髦的意思。
一些例句及其中文翻译如下：
She always wears fashionable attire to work. (她总是穿着时髦的衣服去上班)
His attire was appropriate for the formal event. (他的着装非常适合正式场合)
She always makes sure her attire is on point. (她总是确保自己的着装很时尚)