Sue Stemp is currently enamored of photographer David Hamilton's gauzy images of flower-bedecked seventies youth as well as captivated by the sly seduction of a John Singer Sargent portrait. The result? Call it Mademoiselle X. The designer's modern-day provocateur is young at heartnote, the rooftop party-cum-presentation was hosted by Tamsin Lonsdale and Arden Wohl, two mischief-making girls on the New York sceneand, as we've come to expect, the clothes were made for cocktails. Among the best pieces were hand-embroidered shorts with tuxedo suiting in cream and black, and delicate silk tops adorned with oversize silk-screened blooms. Working in a neutral palette of "makeup colors" (translation: cream, ivory, and rose), Stemp offered romance and raciness. One dress, in factshort and tieredwould be just as appropriate in the boudoir as on a banquette.