bleach any white items. put bleach directly onto the mould and then wash on as hot a wash as the clothing will allow.
with any coloured stuff you can buy a stain devil for mould. i got mine from john lewis, as this happened to us when we got back from holiday some of the clothes from the washing pile had gone mouldy, mainly stuff that had got stains on from the kids that i had soaked on holiday and then put into the case still damp.
most of it came clean, but i did have to throw a few t-shirts away.