The scenario is absolutely authentic: Jamaica is embarrassed by her hand-me-down boys' boots and jealous of Brianna's pretty pink ones; when Jamaica's wear out, she chooses cowboy boots so Brianna won't say she copied--only to have Brianna tell her that they ``aren't in''; hurt, she declares Brianna's ``ugly.'' All comes right when the two finally level: Brianna's boots are also hand-me-downs, and she can't wait to grow so she can replace them. Yes, the story's about boots--as important an arena for choice and identity for small children as for their elders--but it's also, in Havill's simple, beautifully honed text, about friendship. O'Brien's warm, realistic illustrations of this vibrant African-American and her lively Asian-American friend are just right. (Picture book. 4-8)