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A division between natural and dark skin tone due to receiving a tan while wearing clothes. Commonly in a swimsuit-like shape, but there are other types.

See also

• accessory tan
• bikini tan
• double tanline
• farmer's tan
• one-piece tan
• pasties tan
• shibari tan
• shirt tan
• shorts tan
• slingshot tan
• tan tattoo
• revealing tanlines
• presenting tanlines