Bryan Singer promises a leather-free "X-Men: Days of Future Past."

The director tweeted "For those of you wondering...no leather suits. #xmen"

In the three "X-Men" films (Singer directed the first two), the mutant heroes sported sleek, black leather outfits, eschewing the yellow tights of the classic comic books.

The 2011 prequel "X-Men: First Class" -- which Singer produced and Matthew Vaughn directed -- took place in the 1960s and hewed closer to the original comic book costumes.

The upcoming "X-Men: Days of Future Past" will bring the two movie timelines together in a spin on the legendary 1980s story line of the same name by Chris Claremont and John Byrne. It features the X-Men of a bleak alternate future as well as the X-Men of the present. 

Time will tell how the mutants -- potentially including Wolverine (Hugh Jackman) and Storm (Halle Berry), in addition to the returning cast of "First Class" -- will dress in "Days of Future Past." 

"X-Men: Days of Future past" is scheduled for release on July 18, 2014.