Historical clue formulations

• Abrupt change in tone, perhaps — 2022-06-11
• Strip at the beach? — 2020-11-06
• Difference between dark and light, in a way — 2020-09-20
• Vacation souvenir, perhaps — 2019-07-13
• *A swimsuit might leave one — 2019-01-08
• What sunning in a swimsuit leaves — 2018-01-22
• Something not seen on a nudist, maybe — 2014-08-28
• Sunbathing evidence — 2014-03-23
• A lifeguard's whistle might create one — 2013-05-14
• Nudist's lack — 2012-06-09
• Where brown and white meet — 2011-01-09
• It may be hidden under a shirt — 2009-01-14
• Separator of light and dark — 2008-09-20
• Nudist's lack — 2007-05-05