R.S.
My daughter is now 14 and we struggled with buying her clothes for years....as the above posters mentioned...JC Penny is where we shopped. They have a plus size section for young girls that fit my daughter great!!!...I dont know what I would've done without them. In the last couple of years, I buy pants and have them hemmed as my daughter has reached at age where she is not growing as fast...
Good Luck,
R.