I don't like shopping with my mum because she wants me to wear weird clothes. How about you?

how 是疑问词，表示"如何、怎样"，用于询问方式或情况。 about 在这里是介词，表示"关于"，常与 how 搭配构成固定表达。 how about you 是一个常用短语，字面意思是"关于你怎么样"，用于询问对方的意见或情况，相当于中文的"你呢？"。