The Southsea branch of Barclays bank swapped their normal uniform for blue fancy dress.
A cake sale and a raffle was held.
Branch manager Christian Hannam, 30 said: ‘It’s been really good. We’ve raised £400 so far today, and we’re hoping to reach £500 - and whatever we do raise, Barclays will match that and donate it all.
‘I’m covered in blue paint and have dressed up, we’ve got two blue crayons working today - all of the staff have done their bit.