Wedding dress for the beach ceremony in April

My wedding date is set for the next April. The ceremony will be held on the beach. I chose a dress style but not sure about the accessories and the need for a warm cape. The open back wedding dresses https://www.cathytelle.com/category/wedding-dresses/?filter_
back=open&query_type_back=or
help me to choose, please! I like the third dress just with the location on the beach, like I'm dreaming about.

In case of bad weather, I need to pick up a cape, so where can I find it? Only a new thing will fit, cause my grany is very superstitious ((
I will be grateful for the web-addresses of jewelry shop with good reputation