Breadcrumb Trail Links Local News When a new policy on dress codes is unveiled in the region’s largest school board later this year, the voices of students will be heard loud and clear for the first time, officials there say. The Thames Valley District school board. (Derek Ruttan/The London Free Press) Article content When a new policy on dress codes is unveiled in the Thames Valley District school board later this year, the voices of students will be heard loud and clear for the first time, officials there say. Advertisement 2 This advertisement has not loaded yet, but your article continues below. Article content The new code is expected in…