What is the best design size for adult t-shirts or should they be different with shirt size?

What is the best design size for adult t-shirts or should they be different with shirt size This is a video on the different sizes on shirts designs and should you keep the size the the same on smaller to bigger shirts and also how I use my cricut vinyl cutter to help me make samples to try out different size shirt designs on t-shirts for customers alot of people say that the average adult design size is 10 1/2 wide you can go bigger I usually will go up to 11in but it all come down to what the design is and what the customer wants if they say what do u recommend I always say 10 1/2 to 11 to be safe on how it looks please like and subscribe Basement215/ Ruthless Branding https://ruthlessbranding.etsy.com