As wives, we invariably reflect on our husbands either positively or negatively. Do you ever visit him at his place of employment? If he works in a professional or business setting, you should not be there wearing leisure-wear.
This restriction challenges me on a daily basis. You see, I visit my husband at his office most days, or at least on the sidewalk outside. We spend his lunch walking. Being busy like you and everyone else these days, it takes discipline not to just show up in whatever.
Hey. If I can get my husband a little bit more respect in the marketplace by dressing nicely (see Proverbs 31:22-23), well, I call that a good reason to go shopping.