Blue shirt

Blue Shirts are items that grow on the walls of many caverns in Super Bowser Bros. Clothing Shops but these items, providing an easier way to purchase them, and be protected from Luigi's Ice Cream Cone Swarm. The Blue Shirt of Wikia is the most powerful shirt and has an effect which makes the wearer regain lost hitpoints rapidly after losing them.

History
Blue Shirts were natural, but were never discovers until a couple thousand years ago, when a group of people from the Star empire hid in a cavern and wore them. Their popularity steadily grew from then on, although the Blue Shirt of Wikia is now legendary, and the only one is being worn by the villain Mario. Dry Bowser used to own one pair of the Blue Shirt of Wikia, but when the enraged Mario threw him into the volcano, it burned to crisps.