Katie posted a question about ease on a recent post. I'm responding in a new post because I think this may be helpful for everyone. Eunny Jang recently responded to a similar question about ease for the Tangled Yoke cardigan on Ravelry:
"I think the model had only an inch or so of ease in the pictured sweater - but I think this sweater would look fine with a couple more inches of ease as well. It's not very dramatically shaped - part of that is the illusion created by how deep the ribbing is. Instant waistline! The ribbing is a garter rib, too, which is less binding than a regular rib, so that stealthy fake waistline doesn't come at the expense of being able to draw a deep breath."