Most of my Cosplay’s belt are done with a fabric tube method. While sewing it is easy, turning it inside out can be frustrating. I realise not everyone knows this little trick so I hope this helps!
I usually turn my tubes with a safety pin or a ruler.
But this method is so much faster O.O! I bet you don’t need to buy those special tools either. If you live in South East Asia, just use your normal Bubble Tea straws (or normal straws if your fabric tube is narrow) and push with a chopstick!
Hope this helps!