I completely agree with
Francesca:
Bulldog clips IMO are firstly too hard to open (need considerable pinching force to get them open) and also they have one small edge which grips which I think would mark the fabric.
I have Wonder Clips and they are very handy for clipping layers together that would shift if a pin were used, or clipping layers that cannot be pinned. My husband bought them for me. I wouldn't have purchased them for myself because they are expensive, but now that I have them I would buy more if I felt I needed more. I can't speak for the off-brand ones, but they seem to work just fine, as
Francesca and
JillH have reported.
I've never had much luck using wooden pegs as they can get knocked around easily because of the long ends. I also have a knack for accidentally twisting the pegs and having them fall apart. They are definitely worth a try if you have them around the house, though! Someone more coordinated (or careful) than I am might have better luck!
I got a set of
Getta Grip Clips when I took a draping course on Craftsy. The clips are really nice for draping. They can also be used much the same way as Wonder Clips, but they are bulky and much more expensive, so I wouldn't suggest them as a realistic alternative. If I need extra draping clips, I use something like this that I've had around the house: