Rubie's Official Marvel Spider-Man Classic Childs Costume, Kids Superhero Fancy Dress

Is the mask joined to the suit or separate?

Delivery says Thursday so ive ordered mine is now saying monday will ots please come by Thursday as stated?

My son wearing 4-5year old clothes but hes actually going to be 4in May, what size should i order??

My son is turning 4 in a couple of months, not sure what size to get him? CAn anyone advise ? Thanks