When I go to the alchemist, none of the layer cards I have in my inventory show up. I'm pretty sure I was able to use them before, but maybe I'm doing something wrong?

Maybe try only having one in your inventory at a time?

First you have to select the [item=Alchemy Token: Wearable] in order to allow the layer cards to display.

Oh that's right! Totally forgot about that part. Thanks! Now I just need to actually get some wearable tokens...

You're welcome and good luck! I've noticed I am not the only one stalking the Philosopher's Store so it's kind of a clicking war :P