If you are making things for tapered glasses, mugs or whatever, here is a web site that will give you the correct shape you need to make it look right.
A few measurements put into the easy to understand questions and it will give you a PDF that you can copy and paste into your design software. I have tried it and it works perfect.
https://www.onlinelabels.com/label-generator-tools/tapered-label-Generator.aspx