How do tell my granny to stop knitting me panties?

My granny is obsessed with knitting and is constantly bringing me knitted panties because as she puts it, "it's important to keep the pot warm."

But they're hardly the hight of fashion and really itchy. Worse still I'm expected to model them for the family.
How do tell my granny to stop knitting me panties?
How do tell my granny to stop knitting me panties?
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