One thing in the world for which no rules are set by its industry. It is none other than the fashion world. Fashion has no rules and no regulations. It is very fickle. Although there is no time duration for which fashion for any particular thing will remain in the trend however only the thing which is sure that particular fashion is surely going to change in the future. No fashion remaiuns constant for the whole life.
On the other side exceptions are always there hence there are some fashion trends which are eternal. Little black dress, Leather Jackets, red dresses, a line dresses etc are some of the trends which always rule fashion. To be fashionable is not essential just for sprucing up the outward appearance.
Keep walking with the fashion trends and enhance your outward and inward duty both.