穿衣戴帽什么时候用IN 什么时候用WITH?

看情形而定。 举俩例：

1. It has been so cold these days, I dressed in my thermal underwear along with my wool sweater. 天冷了， 我穿了保温内衣跟羊毛衫

2. She dressed causal but in fashion. 她穿得简单而时尚。

就是用in一般不用with啊！

i saw that girl in hat
i saw her in red pant