Bustier or adhesive bra?

The best thing to do is try some out - try out adhesive bras for the day and then try some adhesive cups and see what you think. You do not mention what cup size you are therefore it can depend on what feels comfortable for you. It is best to try them out before the big day and then you will feel completely comfortable. There is a site that you can get adhesive bras for $10 and you get a pack for free. Good luck and hope you find something that will make you feel great.