My simple trick to being ale to embellish jeans - is to buy a mens pair of jeans larger by 6cm than i need to fit me I then split open each leg down the middle - either the centre back or the centre front of the leg. This allows me to sew onto the fabric whilst it is flat, making life sooooooo much easier (no pun intended 😊).
With this pair of jeans, I wanted see how they would look when the seam went down the middle of the jeans leg interrupting the embellishment.
I simply sewed squares of fabric onto of the denim in random places.
Then turn the jeans inside out and resew the centre from seam of each leg. I overlock the seams, hover if you don't have access to an over locker then simply use a zigzag stitch on the edge of the fabric or 'pinking shears' which are scissors with give a 'zig zag' finish.
I know I make it sound easy and once you have a go - it is I promise ❤️ but if you ever need any help or advice - please feel free to contact me 📮.