I will attend a staff party, what should I wear?

My employer is hosting a Christmas dinner. I will be attending and I was not sure what to wear there is basically no dress code but they said we can dress up if we want. I want to dress up, but nothing crazy. I am very conscious about my body and i want to cover up. My crush will also be in the party any recommendations?

I will attend a staff party, what should I wear?
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