When I print on the back of polos I feed the shirt platen into the shirt so that I have a flat surface to print on. If you are going to do a small "pocket" chest print on the front, use a flat object to raise your print area above the buttons and collar...then lower the platen a bit to compensate. If you don't already have one, Anajet has a pocket print adapter that makes this extremely easy for you. I bought mine for $45 (I think) and I have easily used it 100+ times. When curing, I place a piece of cardboard inside the shirt which keeps from pressing an impression of the buttons and collar into the back of the shirt. I pretreat these exactly the same way as I do t-shirts. Hope this helps!