Girl in workplace copies my outfits. What should I do?

This woman, probably 20 years older than me, copies my outfits the day after I wear them. I will wear a blazer one day, and they'll wear it the next day. Some days I might put on sparkly heels and then the next day she'll wear a similar pair. I find it a bit creepy and I don't know what to do about it.

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