Hey folks,
We're aware that some Outfits have some extra starch in their cloth, causing certain clothing to be stiff rather than flexible. We'll get these issues smoothed out as soon as we can.
In the meantime, if you're experiencing a problem with an Outfit, please let us know a detailed description on what it is, which platform you play on, and which Outfit it's affecting.
Thanks a bunch to the OP for bringing this issue up and for all the additional clarity/information in the comments.