On hairstyle, the Elvis Presley style with sticky and greasy pomade was "in" until some time mid-60s when the mop top Beatles started to gain fame. When the Beatles took center stage, that was the advent of the "long-hair" era. Other bands that became famous sported longer hair than what the Beatles had. The famous pomade lost its gloss and hold. During that era, many barbershops closed down. Womens' hair saloons were more frequented by long-haired men. I don't deny that I was one of them.
In the recent past, late 90s to present, the fad of over-sized or loose garments came in. It seems that old clothes of Dad in the 1940s or 50s were back (only not to size). Putting sports jerseys over them also became a fad! Many 'rappers' sported this fashion.
Hairstyle for men almost went nowhere! Why? Because the trend became "No-Hair"! Clean shaven bald head was in! Barbershops started crop again as there was no styling needed. They are the experts in shaving the head. No style to worry about. The hairstyle for men now is on how one feels about it. There are still a good number of younger guys who prefer bald. I think this trend about hair for men will not change not until an entertainer as famous as the Beatles or Elvis Presley will again set a trend.
Photo credits to Yahoo! Images