Thanks all! I plan on taking two dresses to the wedding and will decide which one to wear when I get there: the original Lily dress (which is rayon, not jersey, and has 3/4 sleeves, not long sleeves) and an Eliza J halter neck “floaty” floral blue/lavender chiffon swing dress (not a maxi, but definitely more formal than the original dress) that I bought from Nordstrom for another wedding last summer and have yet to wear (long story). I’ll see what my sister-in-laws are wearing (one is mom of the groom) and make a decision then. My silver sandals and silver clutch on a chain will go with either dress so no problem there.
I think flowy styles look pretty for the beach… but remember that beaches are often breezy - for modestly sake, avoid short styles that will catch the wind.
@soozievt, thanks for posting those dress links. I actually ending up ordering two of them to check out in person (I really like the midis). I’m happy with both of my current dresses, but will keep looking in case something “better” turns up. I have another 6-7 weeks so all is good. I spoke with my sister-in-laws and have discovered that “beach formal” absolutely does cover a wide range of wear and most dresses (of any length) would suffice just fine.
@soozievt, the dress that came from your link is the Adrianna Papell
Tea Time Floral Print Midi Dress from Bloomingdales. I really love the coral color (I’m tired of pastels right now) and I also love the flowy skirt. I think that I would get more wear out of something like that than I would a maxi dress. And I have some gold sandals that I think would work really well with the dress.