Looks like it would totally work, but I'd be a concerned about gapping @ the armholes if the fabric is too stiff....

You could add a slit & a button& loop or hook & eye @ the back if it's too to snug get on comfortably.
Sometimes the only way to find out is to make it. Maybe in a some cheap fabric - before going w/ the 'good' fabric....?

Look like it would go over the head very easily as the neckline isn't too high,nor too low,and the rest of the top is full as well.

If you have some old sheets,use one of those to make a sample out of.

Have some Faith in yourself,You can do this!!!!!
Kathi

Know this post is a little late, but it will work.
Measure your head, then the opening at neckline on pattern minus the seam allowances.