Riding breeches - full seat synthetic leather - children's breeches / teenager

Riding breeches - full seat synthetic leather - children's breeches / teenager - I am offering a pair of breeches on behalf of a friend.
The breeches are black in color and have a full seat made of synthetic leather.
The size is stated as 38-40, but I wear 36-38 myself and don't fit. My friend bought them for her 12-year-old teenage daughter. I am therefore also offering them as children's breeches.
The waist is a loose 38 cm, the waistband is stretchy with an elastic insert.
Inside leg length approx. 72 cm.
Leg ends with Velcro fastener.

The breeches are as good as new.