Off White recommends a size based upon your measurements at the time of your order by referencing the designer's size chart. We typically recommend the size associated with the largest measurement provided. If you measure at a size 16 or greater, you may be subject to a designer sizing fee. These fees vary by designer and by size. You are ultimately responsible for the size ordered and any alterations costs associated with making the dress fit appropriately. It is RARE to not require some sort of alterations to these dresses. Off White does not offer alteration services, but we are happy to make a recommendation.