Does that mean that the front of the sleeve is sewn without any fullness but the back has some fullness worked in?
Surely not? What posaune
illustrated (in my opinion) was that in the lower part of armscye, roughly from the front notch to halfway the back notch the sleeve is attached to the armhole without ease. Above those marks ease is incorporated according to design and nature of the fabric. Here she has chosen 8% ease. Some fabrics, e.g. your typical shirt fabric, will not tolerate that much ease without puckers and folds, so the maximum amount of crown ease is determined by the characteristics of the fabric.posaune
showed a method to reduce the ease in the crown; other methods are available.
As it happens, I'm re-studying Morris Campbell's excellent treatise on the subject, but I'm using computer modelling instead of the engineers' development method he used, so at the moment I'm absorbed in armholes and sleeves...
How refreshing to have a different subject here for a change.