Looking for a gown in SF/East Bay

Besties I need help. I’ve got a wedding in Cartagena next month and would really like to thrift something or shop in person rather than buying something minimal online that I’m unsure will fit me right. It’s an evening reception and the wedding is gonna be huge. And when I say huge I mean massive the girlies like to step out and the guests dress beyond black tie/gala gown vibes.

Are there any stores you know of in the Bay that would be worth checking out that have more reliably curated selections? And if not, tbh I’ll take anything that might have a good find!!

Thanks in advance 🙏