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The sentence in question: 赤と白のしまのセーターにジーンズをはいた女の子ですね。
1) Is it necessary to write い-adjective + の here, or would 赤くて白い work as well? Is there a difference in meaning?
2) why is there this に? I can’t make any sense of it. To me the sentence says: „It is a girl wearing jeans and a sweatshirt in red and white stripes.” What function does に have in this context? Oo