Taking in the Hermès scarves displayed in an upstairs gallery of Galveston’s Bryan Museum, it’s hard to say which is more astonishing: the natural realism bursting from these square silk fragments—the blazing plumage of a vermilion flycatcher, a coyote howling, the gaze of a ten-point buck—or the fact that the reclusive artist who designed them is a retired post office worker in Waco. Painter and mail sorter Kermit Oliver may be one of Texas’s most enigmatic artists, but he and his Hermès scarves maintain a cult following among well-heeled Texas women, and “Kermit Oliver & Hermès: Storytelling on Silk & Canvas,” on display through June 22, shows all seventeen designs together in their full splendor. Curated by Meg Tucker, programs manager at the stately Bryan Museum,…