here are coat for young people这句话是here开头的倒装句,here+谓语动词+名词,here+代词+谓语动词.或者还原成正常语序是coat for young people are here.类似的还有here comes the bus!车来了,还原成正常语序是the bus comes here.
所以你第二句的不符合here开头的倒装句,here+谓语动词+名词的格式,所以是错的.