"her faded flannel gown"

In Garth Brooks's "The Thunder Rolls", a wife is waiting for her philandering husband to return home, late at night. She's anxiously waiting by the telephone, "praying it's the weather that's kept him out all night". I find it vexing that Brooks chose to put her in a "faded flannel gown". It makes it clear that this is a woman who doesn't dress up for her man, and who is angry that he is cheating on her. I don't see how the listener isn't meant to draw the conclusion that at minimum this relationship is stale and old, and possibly that her casual ways drove her husband into the arms of another woman, one who (presumably) is perfumed and dresses better. Or - dresses not at all, perhaps.