How do I get a guy to give me his jacket?

Me and this guy have a crush on one another. I really like him and he knows that. I have been forgeting my jacket at home and freezing half to death and I barly see him but when I get to talk to him I never can seem to ask. How can I be less shy to ask or how do I get him to lend it to me without asking?
How do I get a guy to give me his jacket?
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