if you had a bunch of custom fields you are adding... or maybe it's conditional, then you can just keep pushing your custom fields onto a list.

personally I prefer something such as:

var apparel_size = new SelectCustomFieldRef(){ 
  scriptId = "my_custom_field_id",
  value = new ListOrRecordRef(){
    name = "Something"
  }
};
cfList.Add(apparel_size);