You don't need a wedding dress to go back, just a red cheongsam. But the return banquet needs the bride and groom to welcome guests, which is different from the formal wedding.
Customs vary from place to place. Suggest that your prospective husband consult the wedding company.
Finally, I wish you and your husband a long life in Qi Mei.
Hehe, my girlfriend and I are also going to have a wedding in June: P