Check the weather forecast for your intended dates of travel. Toronto winters are fierce and frigid. The summers are hot and humid. Pack business attire appropriate to your line of work. Suits are a staple for most men and women.
Women wear hose in the summer, despite the heat, and tights in the winter for warmth.
Think comfortable and casual for taking in the sights and sounds of the city. Bring a very heavy winter coat, long underwear, sweaters, boots, socks, gloves, a scarf and a hat if you plan to be there between December and March. Wear rubber-soled shoes to avoid slipping on ice and snow. Choose lightweight fabrics such as cotton and linen for summer visits, as these natural fibers will breathe in the heat. Pair summer attire with comfortable walking shoes or sandals.