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Please pull the clothes' zipper down.
请把衣服的拉鍊拉下来.
Pull the zipper of the clothes down please.
把衣服的拉鍊拉下来,麻烦您.
Please slipping the zipper of the clothes down.
请拉开衣服的拉鍊.
当然,楼下那位知友回答的也没错,明确一点的拜托他人帮忙的话,一般是这麼讲：
Could you please unzip the dress for me?
能否请您帮我拉开衣服(裙子)的拉鍊吗?
Please unzip the clothes for me,thank you!
请帮我拉开衣服的拉鍊,
