Dress me for a wedding!

This is a huge step for us irt covid, but a childhood friend of Dd is getting married! I’m close to her mom, also. Ceremony is indoors so we will go masked or maybe miss it :( but the reception is outdoors in the fall. it’s a late afternoon/early evening event in a potentially chilly place on the CA coast. I’ve never been to an outdoor wedding like this (where weather is a big factor) and need help dressing for it!

I think I wear a 4 petite or 6 petite and can hardly find anything on Nordstrom or Nordstrom rack!
If it’s chilly, I guess I should wear long sleeves. It might be awkward to wear a shawl the whole time.

Any ideas?