Once you want to "dress the part of a figure skater," going to Target or Walmart or a supplier of dance clothes is a good way to find something appropriate.
At first, a leotard with a skirt and dance tights will do just fine for girls and for boys, athletic pants, a shirt, thin socks, and a jacket or sweater are all that is needed.
Many skating dresses can be found on EBAY. Also, some ice rinks have a shop that sells new skating dresses and figure skating outfits on consignment.
Sometimes there is a seamstress that makes skating clothes that everyone has found by word of mouth. Ask a skater that is wearing a cute outfit about where he or she found that skating dress; you may be given a name of a good store or a seamstress that way.
Walmart does sell beige dance tights, but those tights are not always strong enough to endure the hard wear they will get by a figure skater, so purchasing actual figure skating tights online is a better route if you can't obtain them locally.
Boys' skating clothes are difficult to find. There are manufacturers of boys' figure skating pants, so type in "boys or mens skating pants" in a Google search, and online suppliers should appear.

