This is the simplest and easiest way to save money on kids clothes. Buy your child's clothes a year ahead at the end of the previous season. Sometimes with growth spurts this may be a little tricky, but overall it should be quite simple.
Just one small example - yesterday I was able to purchase some clothes for my son from Crazy 8 through end of season reductions. I purchased 4 polo shirts, 4 long sleeve shirts, 2 beautiful sweaters, 1 pair of corduroy pants, and 2 pairs of shorts all for under $100, including shipping.
Purchasing clothes at the end of the season for the following years allows you to get the best reductions. It is a good idea to keep an inventory of what you have purchased because these clothes usually get tucked away upon arrival. You don't want to forget and end up purchasing more than you need! Most of the time you can reduce your bill by up to 50%!!
I like to make a list of clothing needed for the upcoming season and check it off as I am able to purchase things. My favourite online kids clothes shopping destinations are: Janie and Jack, Crazy 8, Gymboree, and Carter's. All of these stores ship to Canada and you can subscribe to all of their mailing lists for regular deal updates. There are always great online deals in October, at American Thanksgiving, and in January.
When it comes to actual in store retailers, Target and Joe Fresh often have great sale racks for end of season purchases.