Get festive with deep blues, warm reds, and florals to boot. This ensemble is cool but not too attention grabbing (so you'll stay in the bride's good graces).
H&M Coat, $69.95; hm.com
Marc by Marc Jacobs Mareika Dress, $500; netaporter.com
Clare Vivier Foldover Clutch, $156; revolveclothing.com
Zara High Heel Ankle Boot, $159; zara.com