a common style of clothing worn by hippies, it can be hand made, by using elastic bands on shirts and then adding random dyes and washing it all together and it makes 'groovy' patterns. Though anyone who wears tye dye now a days probably buys it like that, and might wear it as part of a costume or to be ironic.
hippie: whoa dude..I spent all night tye dyeing my socks man, grooovy whoooaaaa *gets high*
mom: when I was a girl I had a tye dye backpack
dude: God this room is bright, it looks like one of jerry garcia's tye dyed shirts!