Sure!
Inge, it's really very simple - and much easier if you have a stencil or a lightboard (like for what people used to use when looking a slides - remember those?).
Chanin has a number of instructions in the books (including different stitches!) but here's my shorthand:
Trace a pattern you like onto the clothing item using washable markers (they have them in the kiddo section of every grocery store here). If you want the color to be permanent, use fabric markers or fabric paints.
Then thread a needle with craft thread - it has to be thick to show. Follow the pen marks and make even stitches, stitching the fabric you want to (ultimately) show through to the BACK of the item. The idea is to make it RATE so make sure you knot on the FRONT of the item - it adds visual interest and texture.
Once the piece is stitched, use embroidery or other sharp scissors to cut out the shape inside the stitches - from the FRONT of the item.
Viola.
You can get a lot more complex than that, but that's the basic.
Like I said, I've used this approach to salvage a number of items which would otherwise be "ruined." It's an excellent thing to do while watching Downton Abbey...