In reply to anomm: Duct tape will do it, if you want something that look a little nicer then you can get in contact with LSR lancashire sports repair and they do propper repair jobs on that sort of thing.
or you can get gore tex patches (i know the jacket isnt waterproof but it will look slightly better quality) from outdoor stores that will proable come with some sealant gule.
i hope this helps.