A good menswear drafting book helps...I highly recommend this one, it has been my go-to reference since the early 80's--
Fundamentals of Men's Fashion Design A Guide To Casual Clothes Edmund B Roberts and Gary Onishenko. Fairchild Publications.
The only book reference number on my copy is: Standard Book Number-- 87005-5143
So if you are interested in this book, a search at your favorite book-seller by Title and Author may be better than using the number.
For more on sleeve cap ease, don't miss this fantastic post by renown clothing industry expert, Kathleen Fasanella.
SEWING NOTES: Collar and Cuffs interfaced with PRO-WOVEN Shirt-CRISP Interfacing from Fashion Sewing Supply Buttons are the 40-count Designer Shirt Button Set in color "Choco-Toffee" from Fashion Sewing Supply.