The question before the house:
Does a wife who sends her husband to the store to buy underwear for her deserve to be spanked?
I'd have to say "No" in general and "No" in this case.
There are certainly many spanking offenses that a wife can commit, but sending her husband to the store for something? I don't think so.
Now in this case, Katie's more serious offense was going outside without panties in the first place. That was definitely a spanking offense, but she's already been spanked for it (three times!

), and even if we only count the one given her by Bullmoose (the guy most clearly authorized to administer this just punishment), the principle of double jeopardy applies.
Of course, Katie being Katie it won't be long before she'll do something else to deserve a spanking.

I feel at this point it is incumbent on me to suggest what that something might be, but the only ideas that come to me at this moment seem rather lame:
1. Procrastination - if she hadn't put off doing her laundry, she wouldn't have run out of panties to wear. (That basket in the first panel was pretty full, so it's not like she didn't have enough.)
2. Foolishness, that is in climbing up that ladder knowing she didn't have any panties on.
3. Foolishness #2 - ignoring the weather forecast of high winds, which made it obvious her skirt would be blown up.
4. Foolishness #3 - wearing that skirt instead of, say, sweatpants, jeans, or a pantsuit.
5. Selling that rare book too cheaply.
6. Something completely outlandish - maybe giving space aliens a bad impression of the human race by walking around with no panties (don't ask what the probability is that Katie is the one female they look at on planet earth), so they give up on us for another thousand years.
Yeesh! That last one was pretty far out - guess it's time to pack it in for the night.