Yea it depends on who made them I think; when we were first issued Multicam in early 2012 they were a weird thick material and no Velcro for wings. That was the year of the rainbow--- guys in the same squadron during the same deployment wore the desert 2 piece, desert one piece, ABU 2 piece, and both versions of the Multicam 2 piece (which fade into very different colors after a dozen washes). Oh, and "issued" civilian clothes too, some of us still wore those to fly.
I'm glad we've finally standardized with a decent incarnation of the Multicam 2 piece. The final step is dumping the green one piece at home and simply having one flying uniform. There is no practical reason to maintain both.