Girls who love boys who like boys to be girls always fare well when gender-bending fashion comes back into play.

Consider adding some gentlemanly style to your currently frilly wardrobe with Whistle & Flute, the debut line of two Cynthia Steffe alums now making its first round of deliveries.

Built almost entirely on shades of black and white (with hints of plum and green), the freshman collection (eight years in the making) is a small but tightly edited mix of androgynous knits and silks.

Dig the slightly UK undertones (the name is cockney slang for “suit”; both ladies are married to Brits) in crepe tops, tailored trousers, and top coats fit for a Hepburn. We’ve got our eye on the military jacket sweater. It’s kind of masculine, kind of feminine, kind of gangster.

Which should always be something you really love.

Available at Big Drop, 1321 Third Avenue, between 75th and 76th Streets (212-988-3344 or bigdropnyc.com); 425 West Broadway, between Prince and Spring Streets (212-226-9292). To see styles, go to whistleflute.com.