To your little sister you are the ultimate trailblazer. No curfew left unbroken. No late-night marathon phone call left undialed. No speed limit left unviolated.

You thoroughly wore in mom and dad, but the most important legacy you left sis was the right to dress any way she wanted.

Which is why you’ll bond over the latest member of Chicago’s fashion family: Her and Girl, the newly opened sister shop to Bucktown’s Him. Two stores under one roof, Her is for the over-18 set; Girl appeals to tweeners (and older teenile sorts).

Don’t be fooled by the retro Barbie dream house decor (pink walls, pink tin ceiling, pink carpeting) — Her and Girl stock all the right modern lines, such as jeans by Genetic Denim, Hudson, and Rock & Republic; tees with ’tude from David & Goliath and Project E; and finishing touches like Elizabeth Gilbert’s crochet necklaces and Zoe & Sage’s 14-karat gold seahorse charm numbers.

In other words, the kind of clothes that help you work that authority-free look.

At any age.

Her/Girl, 1543-45 North Damen Avenue, at Wicker Park Avenue (773-235-9515).