I guess I regret getting too big to wear the kilt I got married in thirty years ago. Also that I had a period of time, before ebay, when I couldn't afford a good kilt (and R-kilt wasn't around).
That's offset with the knowledge that I now have the resources to splurge pretty well whenever I feel like it.
And I should be thankful that it was never a problem at home (birth or married). Even my brats thought my kilt was a better choice than what I usually wear.