oooh!!! I love it (and its ORANGE)! That is very typical mid 60s orange before things started moving into that sunset orange/mustard/avacado color scheme in the late 60s/early 70s.
I like the style of the top. Most are made so a gal can't wear regular undergarments with it.
To me the label looks older too. COlor+ label I would say 60s, but maybe the Hawaii experts have something to say. The ruffle on the hem if that is what I am seeing looks 70s to me, and the print, at least how I am seeing it is a bit arty versus straightforward hawaiian. I am betting its more like 60s though.
What does the size say? that might give you a clue too on how it runs.