Do you have MS paint on your computer? If so, download the skin you want to merge with the uniform and the uniform itself and open them both in separate tabs of MS Paint. Then, you'll want to use rectangle cropping to select the entire head layout on the skin image, and copy. Now go to the uniform, and select the head section on the skin layout and hit paste. This will make it so that the overlay isn't transparent anymore though so you'll have to go into a skin editor to erase the white on the overlay afterwards. I hope this helped <3