Someone new walks in and her posture changes before she finishes the sentence.

Back a little straighter. Chin up. Hair moved off her neck. Voice suddenly brighter. It may have nothing to do with that specific person. Fresh eyes are enough. The table she came with has already seen the outfit. The newcomer has not.

Her husband notices because he saw the earlier version. Five minutes ago she was tired, scrolling, half laughing at the story. Now she is sitting taller and giving a better reaction to a joke that did not get any funnier.