Have you ever wondered how this is done?
If you can crochet chain and double crochet you can master this.
I have made over 50 of these blankets in true tartan clans for friends and family and they love them.
I use 8ply acrylic yarn as you can throw them in the washing machine.
If you have a specific tartan you are interested in doing and want to know let me know in the comments. If there is any interest I will do a tutorial and you will be crocheting in no time at all.
See below some of the ones I have made.