One of my eldest son's hobbies is Anime. When he went to a "Geek Meet", he wanted a simple costume to wear.
His idea was to make a pair of the glasses worn by a character called Kamina (don't worry, I had to google him as well).
This is what I did...
(I ought to point out, that photo is not enhanced at all - I think the bright orange colour made the camera wash out the rest of the frame.)
Step 1: Design
It didn't take much designing - a quick google revealed the startlingly angular shape I needed.
Kamina seems to keep the lenses of his shades in place by magic - I couldn't see arms anywhere. My son doesn't have magic powers, and wasn't keen on the idea of gluing them to his forehead, so I had to design arms as well.
I've attached the various files I created, but you will need to re-size your design to suit the wearer's head. Make sure that the holes in the lenses match the thickness of the material you cut them from.
Step 2: Fitting
Although I bought a decent-sized sheet of clear amber acrylic online, I tested the sizing with card. It took several iterations to get them not just fitting, but proportioned to his taste.
(In case you're wondering, I had to take photos of him wearing each sized version for him to check the look.)