Jessica Alba, or as we like to call her, "Queen of the Boyfriend Jeans," pairs denim blue Birkenstock sandals with an airy top and slouchy jeans for an off-duty weekend look.

The Man Repeller's Leandra Medine's white Birkenstocks appear professional and polished, while still retaining their laidback appeal, when worn as part of a monochromatic ensemble. Stick to tailored pieces in classic colors for this more dressed-up look.

The appeal of Birkenstocks rests in comfort -- and a little quirk. Fashion blogger Style Limelight embraces both with her high-fashion take on the tomboy look. An oversized blazer and sports jersey, plus basic black Birks and total bedhead equals perfection.

Multi-colored Birkenstock sandals with an asymmetrical design were spotted at Houghton's spring/summer 2014 Fashion Week show, prompting Women's Wear Daily to speculate Birkenstock may be the "brand of the year."

We love everything about actress and creator of Flower Beauty, Drew Barrymore, including her laidback take on "business casual." If you want to break out your Birkenstock sandals again, and you're still at a loss of what to wear with them -- you can never go wrong with boyfriend jeans.