Apparently there is some sort of incompatibility going on between certain base clothing options. There are some base clothing that disables limb slider customization, and others gery out a bunch of options as well. I had to make more than one character to learn that "old" outfits are only given at character creation and cannot be chosen if going to Salon after character creation.
This whole thing needs to be seriously reworked. Whatever the old system carried over from PSO2 needs to be compatible with everything new coming from New Genesis.