Kids Astronaut Costume Game Space Suit Red Blue Jumpsuit Halloween Backpack Cosplay Costumes for Boys Kids Aged 3-10

How breathable is it? It looks like that would be an issue with kids

Is this costume hard for an older child (10 yo) to manage by themselves? (e.g. to go bathroom)

When will this item be back in stock?

My son is 9 and wears a size 12, but can still fit some size 10/12 although they're getting a bit short. Hes about 55-56 inches tall. Would an xl fit?