Okay, this one is embarrassing - it falls squarely in the "I know better, but..." category.
I'm afraid I'm a bit lax with my neck facings - I rarely understitch and I never tack them down at the shoulder seams. :(
So, how about you? Do you understitch? Do you tack? Do you take it as far as the photo above from St. Gemma's Art and Needlework blog and actually handstitch all the way around the facing?
Go ahead - I'm braced for the scoldings... ;)