CANT EXCHANGE CHRISTNING CLOTHES

Last week my husband bought a christening outfit for our 6 months old baby boy. He came home with a 3 - 6 months outfit and when I saw it I told him that this would be to small. I entered the shop and told the lady that my husband bought the outfit and I would just like a bigger size. So I left the slip and outfit with the cashier and went to go look for a bigger size. Then my daughters told me that the two ladies at the till took the outfit out of the plastic and they a smelling he outfit. I turned around and saw them touching an smelling the outfit. Then the cashier came to me and said that I cannot take a bigger size because they don't do exchanges on christening clothes. I EXPLAINED that my husband bought a size too small and showed them my baby and that the outfit would never fit him. The manager came and said that it looks like the sleeves was ironed and that the is 'n mark on the clothes and that there is no tag as well. A PERSON CAN CLEARY SEE WHEN SOMETHING WAS WORN OR NOT. THE CASHIER SHOULD HAVE WARNED MY HUSBAND THAT HE MUST BE SURE ABOUT THE SIZE AND THAT THEY DONT DO EXCHANGES ON CHRISTNING CLOTHES.<br> <br> WHAT CAN I DO NOW?<br> <br> LOOS A R320 AND BUY A BIGGER OUTGIT???