Plenty of people in the Marc by Marc Jacobs crowd were still coming off the fashion high produced by his spectacular signature collection of the previous evening. More so than usual, his little-sister line provided a compelling sort of coda. The mix-and-match, more-is-more sensibilities of one collection echoed the other's. There was even a bit of overlap in the silhouettes: Here, utility belts worn in multiples and sometimes slung with nylon fanny packs replaced Monday night's glittering sashes. But if the former verged on couture, this was kids' play. Silhouettes like baby dolls and trapeze dresses will get the youth vote, likewise the patchwork denim and the splashy prints. Tweedy jackets with rolled-up sleeves and pants with paper-bag waists, though, have real crossover potential. And with the money those brocades will cost you, at least one thing's for certain: The price is right.