Re-In or Re In

When something that was once in style/popularity, looses its hype, and gains it back again.

past tense: re-inned

To re-in something:re-ins
Someone who re-ins something:re-inner
etc

Yea man, Christmas sweaters are Re-Inned every year during the holidays.

Dude, I swear I was the one to Re-In the raw food diet.

Re-In or Re In, both will work.