question about jacket for wedding

[aj555]

I'm getting married soon, and wanted to know if it would be alright to dress formal (tie, dress sporran, ect.) but no jacket. We're having a ceremony in Russia on the Black Sea and it will be extremely hot. We decided on the kilt as more of a last minute, and it will be difficult to rent a jacket for the period I am gone. I will only be wearing it for the ceremony itself. The only other time I wear my kilt is at highland games, which I dress in day wear. Can I get away without having to spend the extra money on a jacket, or is it a must do thing? What about with a french cuff shirt? While weddings themselves are generally formal, we aren't having ours that formal (no tuxs, ect) more laid back. I tried doing a search but only found results for people attending other peoples weddings.