After 6 days checking the stores and finding nothing new, I finally found something odd... Tierno's Vanillite T-Shirt became available at Cyllage's Boutique, it was named Twin T-Shirt and is the last shirt on my list (after the King T-Shirt)...
Meanwhile I'm not planning to dress that monstrosity, it impressed me to find a new piece of clothing after so many days checking, maybe this mean that there are some secret and rare shirts/hats yet to be found?