Why not go rooting around to find old garments that are no longer worn and use them, you can use up all your scraps on practising, and if you haven't any then a trip to the charity shop and pick up some old sheets/curtains that you can cut up and use without it costing a fortune. You do not obviously have to go following the exact fabric they are suggesting, especially chiffon etc. as that would be mad, good old calico is fine.
I am about to start stitching on some knit fabrics which I have never sewn on today's modern machines, and as it happened somehow my husband got bleach on his knit pyjamas and wanted to bin them, I have pounced on these as they will be ideal for me to experiment with.
Have fun.