You’ll have to find textile manufacturers in Australia, I’d recommend looking at Etsy to see about linking up with someone local. Keep things small scale until you know you can make money from it. Are you willing to go to local markets and sell your product weekly? How will you be selling this? There are heaps of things to consider past the idea stage. First and foremost how much time you can put in to making this an actual business.

You can work fewer hours and make similar if not better money. Assuming you can generate leads and have a good network its a natural progression.