This may not be a term that you are au fait with. In NZ schoolkids in 'mufti' means not wearing school uniform. It's usually associated with some special occasion. This time at grandson Jacks school it was a fundraiser for the Red Cross and Christchurch. Jack came home with a note for his mum saying that it was a mufti day and donations would be accepted for the relief effort for the victims of the quake. Lucy gave Jack $10 to take but he said he had some money to take. He had emptied his 'Piggy bank' – a total of $25 and some cents. He said that he could wait for the “Hot wheels” toy he was saving up for- because the people in Christchurch didn't even have proper toilets.
At 71 years old , the tears welled up in my eyes!