DISGUISE Official Deluxe Super Mario Luigi Costumes for Kids, Halloween Costumes For Kids Available in Sizes S, M and L

Can the pad for the belly be removed?

Is the green shirt included?

My son is a tall 7 yo and thin. He's 53", his t-shirt size is 6 but he wears a sz 8 on pants for the length. Should I size up to 10-12?

how do kids go to the bathroom in this? are the pants separate from the top?