Reddit reviews New Hampshire, Volume 8

For the space helmet:

> For most costumes involving dome helmets, measure how large your head is and try to consider how large you would like your helmet to sit. Typically, you’re going to want something 14-18 inches in diameter.

> Here are 3 spheres you can purchase off of amazon [(1) (2) (3)], all are large enough for helmets and have pre-cut openings, although you can always make them larger if you need them to.
Make sure you add holes so you can breathe! This is super important!

> Here is a tutorial for a Captain Olimar (from Pikmin) cosplay which guides you through adding holes, adding neck support, and any other backing or details you want to add to it.

From source

Edit for the glasses:

Here is a tutorial showing how to use transparent vinyl to make custom costume glasses. I'd just use round lenses, which you can get for cheap at Value Village, ebay, etc. Alternatively you could use a method like this and create the cat-eye shape by painting the lenses, rather than using cut-out vinyl shapes.

Here is a tutorial for making cosplay goggles, rather than glasses.

There are a lot of cat-eye shaped frames available on ebay and Amazon, too.