Shaping the pattern to the form

To me, the hardest part of designing costuming is creating patterns or graphics that need to wrap around folds and creases in fabric. Fortunately, Photoshop has the very handy Warp tool. To use the tool, I make a selection, then hit Cmd+T, then right-click and select Warp from the drop-down menu. Alternatively, you can go to Edit>Transform>Warp. By dragging your selection around, you can conform it to all sorts of shapes. Usually, I make selections based on where there are breaks or folds in the fabric.