If the true value of your wardrobe can be calculated using the cost-per-wear formula, sexy lingerie’s never worth it (be honest) — and jeans are practically free.

Which is why we’re investing in R13 Denim. Already in NYC stores like Opening Ceremony and Barneys, the company reinterprets last season’s boyfriend cuts into cropped harem pants, slouchy-skinny, and drop-crotch styles that give the old workhorse a fresh look.

Distressed details and dark washes convey a vintage feel, and soft, stretchy cotton makes the collection comfier than denims of days past. (We’re wearing ours with a fitted tank and a cropped jacket to streamline the silhouette.)

Also vying for staple status are R13’s jean jackets and vests, stone-washed cotton and flannel shirts and distressed-leather motorcycle jackets. But for those, we’ll leave the math up to you.

Available at Selfridges, 400 Oxford Street, W1A 1AB (0800 123400 or selfridges.com); Harvey Nichols, 109-125 Knightsbridge, SW1X 7RJ (020 7235 5000 or harveynichols.com). To see styles, go to r13denim.com (£150-£1,250).

Photos: Courtesy of R13 Denim