From its second-story perch in the West Village, Jake Mueser's atelier overlooks Christopher Street like a jewel box. During her most recent visit, OST founder Melissa Martin arrived in the early evening and was immediately struck by the feeling of entering a friend's chic living room. The space was adorned with spiral stairs, Turkish rugs, a bar cart stocked with Negroni ingredients, walls lined with prints, sketches, clothing patterns, and textiles. While one client lounged on the leather sofa, sipping a drink and reading a magazine, Jake took the measurements of another.