To most, the diagnosis would sound dire. The delicate silk material of a jacket that had come into Eva Joan, a repair shop in the West Village, had “shattered.”

On a recent winter afternoon, Emma Villeneuve, a co-owner of the store, was in a back sewing room looking over the work that had been done to fix it. A matching fabric had been sourced to address the areas that were the weakest, she said, and the shop’s tailors had patched and mended both the inside and exterior of the jacket. Then they had satin-stitched buttonholes, sewn on the buttons and whipstitched the pocket.

“The client wanted it to look integrated, and that it didn’t look like a contrasting fabric,” Bjorn Eva Park, Ms. Villeneuve’s business partner, chimed in. Elsewhere in the room, a wine stain on a blue dress had been remedied with an embroidered flower.

The pair opened Eva Joan in 2021, in a tiny space next door to Casa Magazines. (“We slipped a note under the door and signed our lease on a cigarette box,” Ms. Park recalled.) Neither had professional experience as a tailor. Ms. Park, 31, worked in production design for fashion shoots, and Ms. Villeneuve, 32, did set design for films and commercials. But they had each tinkered on their own sewing projects and had in mind a kind of business they hadn’t seen before — one where mending, alterations, embroidery and education could be brought under the same roof. They also wanted to sell one-of-a-kind pieces and hard-to-come-by fabrics for others to pursue their own projects.

The store’s name is a combination of their grandmothers’ names.