There isn't much research you can do because this is a fairly new subculture based more on aesthetics rather than music and politics.

It is still a subculture because it is very different from the normal wear and takes a lot of effort.

Clothing:
Thrifting is always great, making your own clothing is good too.
Buy beads and string to make kandi jewelry.
Kids sections of target etc. get the hello kitty shirt or that sparkly skirt.