The Paul Stuart Custom atelier at the clothier’s Madison Avenue flagship is as elegant as the shirts, jackets and suits it masterfully produces. Nestled on the mezzanine, this clubby enclave recalls the brand’s preppy yet classic lineage, with plenty of leather, dark wood and Scotch on hand. Director of the custom program and eternal yes-man Mark Rykken oversees the creation of each suit, usually completed in three to four fittings, down to the handsewn buttonholes on the lapels. As is to be expected, his fabrics are sourced from the finest mills—but it’s what he does with the Italian wools and rich velvets, tailoring them to Paul Stuart’s modern version of the English drape, that makes his work so beloved among discerning dressers. Recently, one such patron, seeking an extra personalized touch, had his jackets lined with his favorite Ferragamo scarves—just one example of how any sartorial whim can become reality. Bespoke jackets start at $3,000, suits from $4,000; 10 E. 45th St.; paulstuart.com.