Keep in mind there is a cosmetic bronzer that may appear on clothes before you take initial first shower. After that first shower and once your tan is fully developed you do not need to worry about your tan transferring.
With that being said, if your dress is tight and rubs in areas there may be possibility of a light transfere but this is nothing a dry cleaner cant fix. (I have tips for this situation so if your dress may rub let me know at your apt and we can discuss some tips/tricks to help)
ABSOLUTELY YES! Your wedding is a huge day and you want to make sure this service is something you 100% love and want for your special day. This trial also gives us a chance to meet, you the opportunity to see how this whole process works and we can perfectly dial in the right darkness and tone you desire. A lot of my brides will book their trial for the bachelorette party or bridal shower and this is also fun because it gives your family and wedding party a chance to see your glow and possibly want to book themselves a tan too.