Trend Alert: The Come-Back of the Birkenstock Sandals.

Time to whip out those investment footwear you bought years ago which had been banished to the back of your wardrobe. 

These hippie-looking cork sandals from German label Birkenstock have been brought back to the fashion scene by Hollywood stars and fashion bloggers alike. 

The stylish Olsens went twinsies with their Arizona sandals as they up the comfort levels of their airport style with these classic Birkenstocks.

British It-girl Alexa Chung keeps things preppy - her go-to look, as she slung a blue sweater over her classic get-up with a Louis Vuitton mini-bag.

Modern Family actress Julie Bowen was casual in her nautical outfit as she attended an event in New York wearing embellished Gizeh sandals.

Naomi Watts matched her cross-body bag and her slouchy pants to the tribal theme and finished the off-duty look with Birks.

Supermodel Heidi Klum braves the heat in of-the-moment palm tree print and denim cut-offs, and of course, her trusty Birkenstock sandals.

Miranda Kerr gets ready for her flight in a comfy get-up consisting of a cropped sweater, ribbed boyfriend jeans and Arizona Birks. 

Renowned fashion bloggers such as Zina of Fashion Vibe and Julie of Sincerely, Jules also love mixing up their looks with the newest star on the footwear scene:

I am guilty of having left my two pairs of Birkenstocks to collect dust, but to be fair, these comfy sandals do correct the shape and contours of my feet with their soft footbeds just after a few wears. I believe they should be the choice footwear for those of you with flat-foot issues. Now that they're back in trend, no reason not to dig out those 15896357 pairs you bought while they were selling like hotcakes back in the millennium.

Birkenstocks are some of the closest cousins of the "mandals" already in the market. "Mandals" or man-sandals have been popping up all over the runway and have now made their way to high-street labels such as Zara and Topshop. 

These chunky sandals are not easy to pull-off, I must say. But if you are keen to take it on, here's a tip or two: 

- Mandals in white or silver are more modern. Use them to update your existing outfits for a sharp look.
- Earthy neutrals are easier to wear. Try them in brown or taupe shades which are versatile but not heavy.
- Platformed sandals are more updated. Ditch the flat ones.