Ghillie Accessories/Supplies
The suit is most of the job. These are the parts that finish it.
A ghillie suit that ends at the neck leaves the two things that give you away: your face and your hands. Veils, boonie hats, neck gaiters, and face masks close that gap. Rifle and bow wraps do the same for hard equipment, which reflects light and holds a straight line that nothing in nature does.
Also here: the netting, thread, and small material you need to repair a suit in season rather than shipping it back, plus the suspenders, bags, and odds and ends that go with a build. If you are not sure what you are missing, tell us what you already own and we will tell you what is worth adding.