(For light fabrics)
(For dark fabrics)
I recommend the long flat pant hangers that have two rectangular clasps rather than the ones that have two small clothesline-style clasps. These can pull on the garment and cause permanent damage.
This rather than This
Also, use regular shirt hangers that do not poke holes in your garment or cause them to stretch too much.
If you're going to take a picture I would do this as soon as possible after you complete these steps. This will give you the cleanest looking outcome. Good Luck!