On this embroidery tutorial Chris & Ellie will give a new life to a pair of jeans. You can apply this technique to any other garment of your choice.
Applying a "closed fly stitch" they are using an embroidery silk to give the jeans a splash of colour. If you don't have the embroidery silk you can easily use any other types of fiber such as wool or thick cotton.
You can be creative and use different shapes, add more items throughout the entire garment or just use this technique to cover up a hole.