Lygia Clark, a Brazilian artist working in the 60's that would
make certain garments, hoods, etc. that two people would have to wear
http://mitpress2.mit.edu/e-journals/Leonardo/isast/spec.projects/osthoff/osthoff.html

Lucy Orta
http://studioorta.free.fr/lucy_orta.html

Optical Camouflage
http://projects.star.t.u-tokyo.ac.jp/projects/MEDIA/xv/oc.html

Urban Chameleon
http://www.kakirine.com/
http://superjenn.1up.com/do/blogEntry?bId=5155551&publicUserId=5450684

Hear Wear
http://www.absurdee.com/HearWear/