They've used a mix overall, Wasp hasn't used the look she's using for a few years either, she's had a more armored design for a while. They go for a mix of iconic, recent and what looks cool. Personally I'm hoping they went really crazy with the alt costumes, just imagine what their designers could doBut like I said, Team Ninja didn't shy away from using the modern designs for Scarlet Witch & Falcon.
Also here's my regular early game team till the dark Dimension but it may evolve depending on who I like in-game but I don't have a hard fourth yet
However I'm saving this team until I can do it in full in the dark dimension and will cruise with them for a few levels