I bought this item without even knowing what it was for. Now I do: it's a sport/yoga abdomen belt, which is also designed to slim up your belly. The measures given by the website are length 66cm (26inch), and it's about 30cm high (this measure I took myself. It is still in it's bag with labels etc.
PS even though the photo is taking the mikey about slim people, this is for larger ladies (but you should have guessed by the measurements).
Sports & Yoga waist belt (Burbage LE10)
This offer has been gifted to someone and is no longer available.