The memo SAG-AFTRA sent out at the top of the strike said wardrobe and make-up tests were indeed against the rules, but maybe fittings were a loophole, idk. All I know is, they would've been foolish not to take measurements and digital scans as soon as they were cast knowing full well a strike was looming (they had a couple weeks, and I'm sure they used them), and the majority of pre-production work otherwise doesn't need the actors at all, so yeah, I don't think there's much that's held them up in the grand scheme. This movie's production really lucked out in terms of the timing with the strikes - the script was locked in before the strikes, they got their main casting in, and it wasn't set to start filming 'til (probably) a few months after. They probably couldn't have asked for better timing, honestly.