How to make sleeve cap

I used the Arc tool from the crown using the calculated diameter and then the Intersect Arc and Axis tool to place the point C1 at a 180 degree angle from the armpit:

You may draw in the line from Crown to C1 using the Line tool.

I’m sorry, I can’t help you with this one. You can have a look at this tutorial and see if it won’t help you: https://wiki.valentinaproject.org/wiki/Bell_Sleeve

(I’m still learning patternmaking and am busy learning the Aldrich way of doing things :wink:)