Why did my crush ask to borrow my shirt?

I was at work and my female coworker who I like came in without her uniform shirt. I walked by her and she said "let me borrow your shirt what time do you get off" then she asked her manager for an extra shirt, as she was walking with her manager she was looking at me. As I left she was looking at me with a half smile.
Why did my crush ask to borrow my shirt?
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