Can you please explain the ruling 'should resemble the clothing of men'? What about loose pants that both genders wear?

So the issue is that any item of clothing that is specific only for the opposite gender should not be worn. Now with regards to baggy loose clothing, loose trousers and so on: trousers nowadays are not something which is specific to men only. It's widespread for females. In terms of course they're different types, but let's say baggy loose clothing in terms of trousers is not something specific to men. Rather it's worn by females as well. So there's no issue with regards to that. The issue comes if there's an item of clothing which is specific only for the opposite gender. That's when it would not be permissible.