A marriage tends to run with less hazzles if a husband obeys his wife in all matters. If she wants him to wear panties, then he should be wearing them within 24 hours - no excuses for delay, just head straight for the clothing shops, then the boxers can be disposed of immediately by burning or cutting up with the sissors.
Men are always thinking of ways to get into a woman's panties, so wearing them is obviously the way to go as quickly as possible. To understand a woman, try and be more like her in as many ways as possible.
I wonder if there are any men who would admit that they have gone up to an older woman in a clothing shop and told her that your wife wants you to wear female underwear, and can she help you select them? Rite of passage stuff, but she could become your favorite salewoman if you tip her generously.