Part of my customer base at ReproductionFabrics.com is costumers...TV, movies, television, opera and theater companies plus Living History Museums and re enactors from around the world.
My introduction to movie costume shops...came during the filming of
A River Runs Through It on the Boulder River in Montana. I had a brick and mortar quilt shop in near by Bozeman, MT at the time. When the production crew sets up to film...they often bring along the 'sewing shop'....costume and set designers as well as seamstresses. Depending on the work load...they may hire local sewers.
One day...a costume designer mentioned needing a 40's style cotton print for an apron for Mrs. Mclean. One of the local sewers mentioned my store and assured them there would be a good selection. The sale was modest (1 apron!) but it opened the door to the possibilities of the movie industry.
I have sold fabric to numerous movies since then...including Return to Lonesome Dove, Cold Mountain, Appaloosa and Cowboys and Aliens and am currently working with the costume designers for a new Quentin Tarantino movie...The Hateful 8.