Another tip buy your little ones clothing in the sales . Buy the next size up.
Buy your little ones clothing in bulk from ebay. Lots of people sell clothing in bundles that their little one has outgrown.
Freecycle for clothing,
Car boots for clothing.
Other mums in your area arrange a clothing swop party.
School uniform our school gives away any lost property not claimed after a year. Also parents whose children are going on to high school donate used school uniform.