When the occasion calls for a touch of class, step out in style with this season's most refined evening wear. Lifestyle cover: tuxedo shirt ($1,100) from Ralph Lauren Blue Label, bow ($850) and cummerbund ($1,750) from Ralph Lauren Purple Label, both from Ralph Lauren, The Landmark, Central. Diamond tuxedo studs with cufflinks ($380,000) from Cartier, Prince's Building, Central. That page: him: monogram silk and cotton blouson ($18,700), bow tie ($1,750), cotton and silk shirt ($5,350), silk trousers ($5,250) and ostrich-leather shoes ($11,600), all by Louis Vuitton, The Landmark. Antique dress-clip ($33,000) from Cartier. Her: velvet tuxedo jacket ($15,800) by Loris Azzaro and velvet trousers ($9,800) by Rochas from Maria Lusia, Lee Gardens, Causeway Bay. Agrafes bracelet ($72,000) from Cartier. This page: tuxedo jacket ($11,000) by Martin Margiela, shirt ($3,400) and denim trousers ($5,300) by Dior Homme, all from Joyce, Queen's Road Central. Pierced handmade leather lace-ups ($11,400) from Berluti, Prince's Building. This page: waistcoat ($7,370), pique bib evening shirt ($5,430) and wool/mohair trousers ($6,930), all from Gucci, The Landmark. That page: tuxedo trousers (part of suit; $15,300) from Lanvin, The Landmark. Pique bib evening shirt ($2,200) by Helmut Lang and leather shoes ($4,200) by n.d.c., both from Lane Crawford, IFC Mall, Central. Babylone cufflinks ($25,900) and Toujours wedding band ($10,350) by Van Cleef & Arpels, Prince's Building. Styling Joseph Li Make-up and grooming Candy Law Hair Morris Tsui at Orient 4 Models Diana B & Fernando J at Model Management