Question: Do you ever go swimming, and if you do, what do you wear?
Regardless of your actual answer, I do find it curious that people often consider "underclothes" to be closer to "naked" then swimwear is, regardless of the actual coverage. This does apply to myself as well... I certainly felt more "naked" when I pulled off my kilt at the airport to walk through the scanner† then when I walked around Anime Expo in a speedo, even though I was certainly showing a lot more at the Expo.
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†I walked through the scanner with my kilt on and the TSA guy said I'd need to be patted down because of the kilt‡. I opted instead to take the kilt off, in public, toss it onto the conveyer belt for other personal items, and walk through the scanner a second time in my boxers. I had a t-shirt on through all of this.
‡I've always wondered what he said to women in skirts. Pretty sure it was a good old fashioned case of "guy in skirt = dangerous". Why do so many people feel threatened by a man in a skirt?