Hi with tappable dressing game the gains “inside the minigame” will usually not work because reader can go ant try all outfits so he can gain all the gains.
Ideal is using points for this because they are usually anyway part of the template.
Like in this one from Dara which maybe was your inspiration as you mentioned.
in case you anyway want to turn the points to gains - you will need to do it after the dressing game you will add under it if/elif/else like this:
if (CHARACTER =1) {
gain Outfit1
} elif (CHARACTER =2) {
gain Outfit2
} else {
gain Outfit3
}