Did I miss something the couple weeks I was off about Apparel Cache Keys? Devs ever say anything about the consistency of supposedly getting them? I'm on 8 Field Proficiency caches and still no Apparel Key. Most I've gone before is 11. I keep track by saving my FP ones.
I never really pay attention to those keys, but I think I got most of mine from the WoNY Season Pass. Perhaps other sources for those keys have been reduced (which would be frustrating for players who don't own WoNY), but I really couldn't tell.