A pub manager from Aberystwyth plans to wear a onesie every day for a year to raise money for MacMillan Cancer Support.
Chris Kiff, who is nearly 6ft tall, says he will not return to his normal shirt and trousers until January 2015.
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It's hoped more people will consider using their local service amid concerns over the future of the bus industry.
Dry across the country this evening with broken cloud and some late sunshine. Scattered showers expected tomorrow.
40,000 people are expected at the motorbike event in the capital this weekend.