Buzz Lightyear Costumes

My seven year old has a thing about dressing up as boy characters every Halloween.  She's been a Stars Wars Storm Trooper, Star Wars Darth Vader, SmallBumblebee Costume Transformers and this year, she wants to be Disney Light-Up Buzz Lightyear. To avoid the rush, I preordered and we received it already from an online vendor.  My youngest wants to be Toy Story - Jessie.  The Buzz costume is too small so I have to come up with a helmet alternative as I don't like to send things back.  I saw some great tutorials on how to make a space helmet but most were expensive.

I'm thinking of getting this Aeromax Jr. Astronaut Helmet with sounds from Amazon. I think with some stickers of Buzz and maybe some green and purple paint, it might work.  I'm really surprised that Disney didn't market a matching helmet given the popularity of Buzz.