Fad and New look

Fad noun - A practice or interest that is very popular for a short time.

New look and fad are semantically related in craze topic. In some cases you can use "New look" instead the word "Fad" as a noun or an adjective.

New look noun - A style of women's clothing created by Christian Dior in 1947; involved a tight bodice and narrow waist and a flowing pleated skirt.

Fad and new look are semantically related in latest fashion topic. Sometimes you can use "Fad" instead the phrase "New look" as a noun or an adjective, if it concerns topics such as in the current style.