You there, in the jeans. Just what do you think you’re doing? That’s three times this week we’ve caught you in casual Friday mode. Why not reach for another bit of blue, like the kind scattered throughout New York-based designer Jen Kao’s spring/summer collection? For her second season, she’s put out a set of graceful, versatile, and exquisitely detailed pieces that are sure to beat the denim blues. On the hybrid apron/dress, pinstripes perform magic: Though they’re layered with a corporate gray cotton, they remain positively charming. The thin, racer-tank dress and slug shirt offer art in the form of pure comfort, but save the sequined tank with hand-printed puzzle pieces for your next night out. And with its mixed-media collage of blue and white patterns, the sexy Nausicaa dress is bound to break a few hearts. Now don’t let us catch you blue-handed again. Available at Stel’s, 334 Newbury Street, Back Bay (617-262-3348 or stelsinc.com). For more information, go to jenkao.com.