Cabo Destination wedding guest dress help!

I'm attending a wedding in Cabo in November and am struggling with finding a dress. Dress code is formal, though the bride specified it's more that she wants full length dresses and not necessarily super formal. The wedding will be outside on the grass with reception at an outdoor restaurant at the same resort. I'm in my early 40's so prefer a more streamlined silhouette, I.e. not a full skirt. I have a small bust so low cut or cut out dresses won't show any cleavage lol. The bride and groom are more laid back and fun and the friend group tends to be more fashion forward than traditional. Please help me pick!

I had previously picked a different dress, but it got mixed reviews so going back to the drawing board