Would it be weird to see your sister in a sports bra?

I wanna start just wearing a sports bra and shorts in my own room, but my brother has to go through my room to leave his room.

I know men can generally be shirtless in front of their female relatives and that's not a problem, but if a woman was shirtless in front of a male relative would that be okay? Or would it make things weird?

I trust him obviously or I wouldn't be considering this, but I don't want to ask him cause I think that would just make it weird.

If it's more likely to be weird than not then I'll just still keep a shirt on unless I'm under the covers anyway.
Would it be weird to see your sister in a sports bra?
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