I think that dress it just fine. Very boho-chic. You don't have to take "hippie" literally - you can jazz it up and make it more fashion forward - not actually 60's stuff. I mean, even if you wore wooden beads, peace sign bling or even add a daisy to your hair - you would still blend in.
If you truely wanted tie-dye - go with ombre coloured items - it was hot this summer and not as obnoxious.