Title: The Sweater. Sentence 1: Jill was knitting her boyfriend Sam a sweater for his birthday. Sentence 2: She went into his closet to get another sweater to size it to. Sentence 3: But when she gave it to him it was way too small. Sentence 4: She realized she had accidentally used his little brother's sweater.
So his little brother got the one she had knitted since it fit him.