Kigurumitchi looks identical to Mimitchi except with a black face to show that its body is actually a costume.
Kigurumitchi comes from the Japanese word Kigurumi which refers to people who dress as cartoon characters or animals.
Tamagotchi Connection Version 2
Kigurumitchi is obtained by wearing the "rare" costume by any adult character although the costume will be removed whenever the character goes to bed. The costume is found by entering all the secret codes at the shop. It can only be obtained once without resetting.