If you need to cancel your order, please reach out to info@vancouvermermaid.ca directly as soon as possible because your order will have been sent directly to the manufacturer and in some instances they begin production the same day. If they haven't yet started production we may be able to cancel your order. If they have already begun production then unfortunately the order cannot be cancelled.It is important to be as sure as possible about sizing before you place your order. Multiple sizing charts are included in each listing (one of which is the actual dimensions of the garment that can be used to compare against clothing you already own which I find very helpful).You may also want to check in with others who have ordered apparel via the private Facebook group: https://www.facebook.com/groups/vancouvermermaidpod