她穿上后看起来很漂亮。She looks very beautiful/pretty/nice in them. “look”在这里作系动词，后加形容词。 她计划穿上他们参加下周班级时装秀。She plans tojoin in/go to the Class Fashion Show next week in them. 表示"人穿着衣服…… ",用in;表示"衣服被人穿在身上"，用on例：You look cool in the coat. 你穿着这件外套看上去酷。
The coat looks cool on you.这件外套穿在你身上看上去酷。如有不懂，请追问~~~望采纳，祝开心!...
我是市中初一的。应该是She looks very beautiful/pretty/nice in them.因为这里的them是指衣服，所以前面用in.She plans to goes for the Class Fashion show next week in them因为这句话里已经有了动词，所以穿着他们只能用介词了。望采纳，谢谢O(∩_∩)O~...
