Girls/women, what casual clothing is attractive and what isn't?

What are some clothes that don't require a lot of effort, but are still attractive? What are some things that you've seen to avoid doing? I'm a stereotypical guy that sucks at fashion and need help lol.

I usually wear jeans, graphic or plain T-shirts, and tennis shoes. During the winter I'll throw in a flannel, jacket, or hoodie.
Girls/women, what casual clothing is attractive and what isn't?
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