You can customise this to your ideal size, style etc.
First collect your equipment:
-Some fabric (I used some scrap material from an old chambray shirt, so it's pretty lightweight, you could easily use something more sturdy if you want)
-Pins (not really necessary)
-Dressmakers measuring tape
I also just want to say I do not think this the best way to make this but this is the way always do it and works fine for me so I hope it works for you too!