According to Forbes magazine, dressier attire is appropriate for company Christmas parties. It is best to dress up for all company functions unless otherwise noted by the company.
Women can wear a nice blouse and skirt with tights or a dress that does not show off too much skin. High heeled shoes or dressier flats are ideal for company Christmas parties. Accessories such as a nice set of pearls or an elegant clutch are dressy enough for the occasion. According to Ask Men, it is best for men to dress conservatively in a nice suit and tie, unless otherwise noted by the company.