Flared jeans were all the rage in the 70s. By 1975, the flare had become extremely wide forming the large Bell Bottom pants the 70s are known for.
The Leisure Suit was an often guady fashion ensemble worn by men in the 70s. The leisure suit consisted of a shirt like suit coat with matching pants. It was usually accompied by a mostly unbuttoned shirt with a huge collar.
Leisure Suit Costumes available from HalloweenCostumes.Com:
The Jump Suit was a 70s fashion look often seen at the disco clubs. Both men and women enjoyed this all-in-one fashion choice.
Baseball Jersey T-Shirts were a very popular fashion choice with the guys in the 70s. They often had an iron-on emblem of some kind on the front. Star Wars emblems were a popular choice in the late 70s.
Mood Rings were made out of a liquid crystal that changed colors to supposedly indicate the wearer's mood
Platform shoes were very popular on the disco floor. These shoes often had 5 or 6 inch heels!
The most famous hair style from the 70s for women was the feathered hair look made famous by Farrah Fawcett.