Consider if your favourite dress suits your vision for your big day, as is. What we mean by that is little things can be changed, add a strap here, lower a neckline there, remove a tulle layer, but the basic construction of a gown can sometimes be difficult to alter. If it’s a slip style gown, it probably won’t hug your waist even after tailoring. If it’s a fit and flare gown, it may not be possible to make it tea length. If you have any concerns, just ask!