Yves Saint Laurent revolutionized women's wear in the 1970s, putting pants in couture shows for the first time. His safari jackets, "le smoking" suits, Russian-boho collections, and tailored Belle de Jour suits are considered fashion landmarks -- these are big shoes to fill. In spring 2004 Stefano Pilati, once the right-hand man to bold-face designer Tom Ford, was named as Ford's successor at YSL. How he'll interpret the house style remains to be seen. The menswear collection, at No. 32 rue du Faubourg St- Honoré, can be relied on for Saint Laurent's classic pinstripes and satin-lapel tuxes. Métro: Concorde. Other locations: 6 pl. St-Sulpice, 6, St-Germain-des-Prés, PHONE: 01-43-29-43-00; Métro: St-Sulpice. 19 av. Victor Hugo, 16, Champs-Élysées, PHONE: 01-45-00-64-64; Métro: Victor Hugo.