It wont put clients off at all! My weight has fluctuated about 4 stone this year and I still had enough clients at my highest weight which was bigger than a size 12. Ann summers do some nice body hiding suspenders (look under Basque section  rather than suspender belt) also playful promises do some stuff for a curvier body.  Good luck and honestly the more weight you gain,your get clients who prefer that so dont worry at all. Just be truthful and they will know what they are getting and be fine with it and you migjt her more clients who prefer a curvy body who didn't see you before! Good luck!