At Saks, I reverted back to my high-school obsession: M.A.C. I picked a pastel shade called “Underage,” a super-light pink. I liked how the moisturizing gloss skipped the sparkle in favor of the wet-look sheen. But although it went on quite smoothly, I didn’t love the color. It looked chalky on my lips—almost white under some lights. 611 Fifth Ave., at 50th St.; 212-753-4000.