I was a teenage hippie in 1969, and I know what real hippies wore. At least, real hippies in the midwest, which by that time had caught up with the coasts.
Every university campus had its group of "freaks," as we called ourselves, and we would congregate on the big open grassy quads and do what we did best - outrage the "straights" - anyone who didn't look like a hippie. The important point in that statement is that you had to LOOK like you belonged, and in addition to long hair for males (and females) the only way to identify yourself was with how you dressed.
The first crucial ingredient in the well-dressed hippie's attire was the pair of bell-bottom jeans. Denim was the standard, but colored cords were ok too. These were also typically low-riders, but nothing like today's skimpy jeans. The bottoms had to be billowy, and the fabric couldn't be too stiff or they wouldn't look right.
Shirts were hard to get right, unless you could afford ordering from catalogs or buying in specialty shops. T-shirts, tie-dyed or plain colors, were always acceptable. Denim shirts with snap buttons were also great inexpensive alternatives, and cowboy shirts of all kinds were good.
Footwear depended on the climate and the season. Sandals were the best for warm weather, old boots for winter, and old-fashioned basketball shoes were acceptable. Definitely no wing-tips or penny loafers allowed.
Outerwear was sometimes a problem to find, because Navy pea-coats were hard to come by and expensive. Fringed leather jackets were the best, and antique leather bomber jackets also fit the bill.
Accessories could be headbands, bracelets, jewelry, necklaces, beads (but usually only females wore them), scarves, belts, wraps - all of these were part of the total fashion statement. Facial hair for males and braids for females were good additions, as were the rimless granny glasses like Ray Manzarek of the Doors wore - I remember being ecstatic when I found the frames and got my first pair.
It was later that tie dye became the art form that it is today, but in my time it was certainly around. Before Grateful Dead followers made anything tie-dyed acceptable, though, it wasn't all that common. Tops, t-shirts, scarves and sometimes pants could be found, but it wasn't a required part of the hippie wardrobe - it was optional.
Basically, if you had long hair and bell-bottoms, you were in, and anything tie-dyed was just icing on the cake. It was an easy time for undercover narcotics agents to fit in!
So go ahead and get a cute hippie baby gift, even if the baby isn't exactly looking like a real hippie...but your infant will certainly feel right at home listening to Grateful Dead MP3s in the nursery!