As Karin and other have said, metal brackets and spilt (or bifurcated) rivets are the way to go for screen accuracy....but no one looks inside your suit, only you
Poppers are better than velcro for the very valid reasons given above.
There is cool velcro called mushroom velcro which I like to use here and here but even then, velcro is hard to get yourself comfortable in.
Poppers take longer to set up but work 100% of the time in terms of comfort and having your suit sit like you intended.
Whilst not bang on screen accurate, Tony's site www.TK300.com has a good popper tutorial