ah the PCEA has evolved past the mobile. I haven't played that yet. I just use mobile or occasionally the old flash system.
However those options of stroke play and skins and match are all things you join for 2-4 people. not tournaments. i assume you get some notification with the invite or is it a complete surprise you don't know until after you join?
they'll eventually add the option in to tourneys. at least i'd bet on it.
It's a smart move to build up a set of apparel. Some of the big money winners in WGT built up what they wanted a couple years ago in case this ever happened.
But then some people always plan better than others.