There aren't any rules about who can see your wedding gown before the wedding. This notion is more a superstition in some cultures that it may bring bad luck for the groom to see the gown before the wedding. Some brides come shopping with the groom. Some brides come with all their friends. Some just with the bridal party and some with their mums only.
It is what works for you and is important for you as the bride.
We love the "wow" moment when the bride walks down the isle and all her friends and family see her in the gown for the first time. It is a great moment for all.
Weddings are so personal that you need to do what is best for you.