Question for you. Would you have to make ones that would fit a grande and venti 2 different snuggies? Also can you do like custom designs? Like if I want one that looks like my cats?

Oh and do they stretch?

They are 100% cotton so they have quiet a bit of give, mine fits a grande and a trenta, it stretches out to fit the largest, then I pull vertically on the stitches to shrink it back up. If you are going to be using it mostly for large teas like this, beer, water bottles or grande sized ones I advise having it a little smaller, but if you want it to easily glide onto a large surface I prefer the larger, which is honestly on larger by 2 stitches. This one was put on to a large water bottle later and it fit, tightly but it fit, the cotton is very forgiving =].

As for being adjustable these are a solid made item with no button or anything, I may do those in the future but they are a little more tricky to keep as uniform in places. But Im playing with a pattern for it.

And I can mimic you kitty to a extent. I can hand stitch in the pattern. Do you have a image? I can tell you what id be able to do =]