Judging from the plunge in the median age around Capitol Hill, it’s the dawn of intern season. And perhaps not so coincidentally, it also seems we’ve morphed into Flip-Flop Nation.

[IMGCAP(1)]Toe-baring beachwear (on staffers of both sexes!) is turning up everywhere of late. So in the interest of public beautification, we’ll refer interns to this handy-dandy guide to fashion, posted on the savvy blog Capitol Hill Style and authored by an anonymous Hill staffer who goes by the handle “Belle.—

HOH particularly likes her Rule No. 7, which bans sloppy floppers. “Havianas are for the pool deck not the marble halls,— she exhorts her readers.

Our other favorite no-nos: Thinking that wearing a cardigan over a tube top makes the outfit office-appropriate. Belle says you’ll only look like “a call girl who was dragged to church.—

Also, leave the silly quilted Vera Bradley bags back on the farm, she warns. “There is simply no excuse for carrying a bag that looks like a 10th grade home-ec project into the hallowed halls of Capitol Hill,— our fashion hero declares.

Class dismissed.

Can’t get enough HOH? Get a midday dose of fun and gossip with HOH’s One-Minute Recess, delivered to your inbox daily. Sign up here — because everyone deserves more recess.