I believe that it was on the SCA Garb list of this painting and the mystery
of the alleged no lacings discussion happened.
Someone on that list blew up the picture (really big) so that you were
looking at the cleavage area. She pointed out that if you followed the
chemise's tie cord, you would see that it ties to the corners of the bodice
My theory is that the bodice is of two, maybe three layers and that the
"trim" is acting as a reinforcement of seams and a little extra stiffener
but no stays.
Her sleeve are tied on, you probably don't see the cords as the chemise
sleeves are drapey and somewhat full so that it probably is enveloping the
tie cords. The left exposed chemise sleeve seems to have an indent as if a
cord is running from sleeve to the bodice sleeve strap.
At the waist I believe she probably has a hook and eye holding it together.