Mattia, if I may, what does the wedding party have planned? Do they plan to hire a kilt and accessories for you? If so, then all of your questions will be answered. Aside from that, the information gleaned from here is extremely valuable to you when you decide to purchase your first kilt for your own special occassions or every day wear.

Best advice at this point concerning the wedding is still to talk to the groom and/or whomever else is handling the logistics of this blessed event.