It's a good idea to have cotton shields sewn into the underarms of your gown. When you apply deodorant, make certain it contains an antiperspirant. The first controls odors. The second helps control moisture. When selecting your wedding bouquet, check with your florist about which flowers to choose.
Some flowers have color-intensive stamens.
These stamens, should they come in contact with your gown, can stain it. If you are set on having such flowers, ask your florist if the stamens can be removed. If you have any allergies to particular flowers, mention them to your florist. Your best bet is to dress at the reception or ceremony site. If you are not going to do that, you will need some prewedding transportation planning.