Rubie's Official Disney Star Wars Darth Vader Classic Child Costume, Kids Fancy Dress

What age is this suitable for? Says small, which on the size chart is 3-4 years but in the title it says it's age 7-8.

Is this costume big or small made ? Wondering what size best for slightly taller than average 6year old ?

Has this blacked out eyes. One picture shows the black eyes and another has a gap for the eyes, my son really wants the black eyes

My son is 121cm in height with 54cm waist. What size would suit him best? Medium or large?