Work from home and meeting colleagues in the flesh for first time at big Xmas party at NEC Birmingham. Very few photos of the venue in party mode so not sure what to wear. Any tips for oldest woman in the company by a long way! Petite size 12 basically straight up and down. Prefer 3/4 or longer sleeves and midi length. I'm thinking black with some glam/glitz but out of my comfort zone so struggling with shopping. Will only wear it once!