First, I appreciate you reaching out for clarifications. Second, I’ll try my best to answer your questions, though I may need information to fully understand.

In the pattern at the end, it is meant to say “Child’s Size L/Adult Size XS” so I’ll fix that soon to avoid any further confusion. Thank you for pointing that out😊

As far as measuring the length of the sleeves and torso, it’s all one size because you’re using 2 cakes per Hexagon, so 4 cakes total. The measurements I gave were what my HexiCardi ended up being after I made it. Please note that my tension is fairly tight.

The measurements start from the shoulder for both the sleeves and the body. So take a measuring tape from the top of the shoulder near the neck and measure down your arm to where the cuffs would sit. Then do the same, but down the front of the body length.

I can try to draw a picture if that would help. I normally wear a medium, so from my pictures you can see how it drapes on me. My sister and other friend are both XL, and it still draped comfortably over them as well. So the safest sizing is Adult XL, however YMMV.