As Michelle Dockery reveals her side boob on the red carpet, we reveal the secret to pulling off the side boob, High Street style

It's a look not many women can pull off, and whether you're an A-lister or an average Joanna, there are pitfalls. So how to pull off this most tricky of looks?

Michelle Dockery in Valentino at the DOWNTON ABBEY: A NEW ERA

PHOTO: Downton Abbey's Michelle Dockery Shows Off Side Boob At SAG

The stars arrive for the Downton Abbey: A New Era premiere in New

PHOTO: Downton Abbey's Michelle Dockery Shows Off Side Boob At SAG

PHOTO: Downton Abbey's Michelle Dockery Shows Off Side Boob At SAG

Michelle Dockery puts on leggy display in black dress at Anatomy

As Michelle Dockery reveals her side boob on the red carpet, we

2014 SAG Awards: Michelle Dockery Steps Out in Plunging Neckline

Michelle Dockery Shows Sideboob At The Screen Actors Guild Awards

Now Kim Kardashian's sister-in-law kashes in! Kaela Humphries lands modelling deal with plus-size brand Evans

Demi Lovato's near nip slip at the EMAs

Nipple-baring is the new black: Braless model flashes extreme sideboob in slashed top - Daily Star

Springfield in Missouri cracks down on Free the Nipple by banning sideboobs in public

Breast in show: 'Side boob' v. 'man cleavage' - The Globe and Mail

Dr Ineke Meredith