Fastest marathon dressed as a sailor

According to Official Guinness Records,

The fastest marathon dressed as a sailor is 2 hr 52 min 32 sec and was achieved by Stephen Richardson (UK) at the 2013 Virgin London Marathon in London, UK, on 21 April 2013.

For a complete list of 2013 records, please visit 2013 Guinness Records in United Kingdom.

Other United Kingdom records that might interest you:

• Fastest marathon in school uniform (female)
• Most consecutive marathons completed in under three hours (same marathon)
• Oldest solo parachute jump (female)
• Fastest music DVD (film to release)
• Farthest distance danced by a couple
• Most participants in a laser tag survival match