Returns/exchanges are not accepted on any items. If you receive an item that doesn’t work out or you would like to sell an item from PSB you can do so on our Facebook resale page.
In general reviews say they run true to size (a few have said on the generous end and more so in baby/smaller sizes). If in between sizes the smaller of the 2 would most likely work (unless you want lots of room to grow/extra length). Some customers size down so it's more fitted/better fit or vintage length and others like to have room to grow or to wear 2 years.