I’m not the only one with post notifications on for Ampwata , the Instagram account that’s home to the bright, hand-dyed shirts made by designer Jasmine Plantin. The tees, released weekly in batches of three to six, typically sell out within two minutes of their arrival online. Lucky buyers receive a one-of-a-kind creation, stitched with the line’s logo (a play on Speedo’s) and adorned with the words of Haitian poet René Depestre on the inside-bottom seam: “By the strength of my wind you will emerge from yourself.” Plantin never repeats a colorway, and she thinks of each batch of tees as a chapter in an ongoing story whose plot is a quest for community and collaboration, particularly for people of the African diaspo ra. Each release of shirts comes with a set of stories related to the ocean, a theme that Plantin settled on after diving into her own origins. “With my mom being from New Orleans, a port city, and my dad being from Jacmel, a beach town in Haiti, I kept s...