Every Halloween more and more people are dressing up in 70s Fancy Dress costumes. 70s Costumes are not just popular at Halloween however. Throughout the year at events such as 70s nights, Stag parties and Fancy Dress birthday parties a large proportion of the people wear 70s outfits. Why is this though? 70s costumes are regarded as cool and funny. The 70s decade is regarded as quite a trendy period of time. 70s clothes are slowly starting to come back into fashion therefore leading to more people looking to wear 70s Fancy dress as well.