They soon turn on their 'own'; never fucking happy.  Plus, once they reach a certain mass, the body just shoves the lard anywhere.  It would be impossible, and business-ending, to cater for all the freakish, misshaped creatures out there and provide essentially bespoke tailoring off the rack.  They'll also expect to pay the same price for three times the material.  Burka-tarp-moo moos should be mandatory for all fatties.