I ordered a prefolded pocket square and didn't like it. It was a white straight across one for my tux. It looked too narrow in the pocket and too thin, looked like a piece of paper folded over.
I have a silk one that i could never fold just right. I said the hell with it and ironed it with some starch and folded it so it would sit wider in the pocket. It looks good now and looks a little thicker.
I only wear a tux every 2-3 years so good enough for me but anyone have a better way with pocket squares?