[Miket61]

You don't need to wear a different suit every night. If you were wearing a dinner jacket you'd look the same each time. Pull out your best navy solid, a white shirt and black shoes and wear it to death. Rotate a couple of neckties and no-one will care if they see the same suit a couple of evenings.

A selection of festive holiday ties will not only vary the look, but some restrained silliness can comfort those who are underdressed.

When I worked for a company that didn't do casual Friday, but had to go to Friday meetings with a subsidiary that was in the same building and did, I'd wear Snoopy ties.