Mario's Glove

From the Super Mario Wiki

Mario's Glove, as depicted in Super Smash Bros. Brawl.

Mario has a pair of Gloves in every game, except the first games, (i.e. Donkey Kong or Donkey Kong Jr.) and in games where he is a baby.

Mario's gloves don't have that much significance in most games, but in Luigi's Mansion Mario loses one of his gloves and Luigi has to find it. After inspecting Mario's Glove, Madame Clairvoya claims that it is extremely sweaty.

Intriguingly, Master Hand of the Super Smash Bros. series bears a striking resemblance the Mario's Glove; particularly in Super Smash Bros., and to a lesser extent in later titles.