1.He is wearing a white coat.
2.He is in a white coat.
3.He is dressed in a white coat.
㈡ put on,dress,in,wear,with的区别
1)put on 和pull on 穿上；戴上。相当于及物动词，以衣物作宾语，着重于穿、戴的动作。put on 为普通用语；pull on多用于穿袜子、戴手套或比较随便地穿上。①It’s cold outside.You’d better put on your hat.外面很冷，你最好戴上帽子。②She put /pulled on her coat and went out of the room hurriedly.她穿上大衣，匆忙地走了。(2)wear 和have on 穿着；戴着。相当于及物动词，有衣物作宾语，着重于穿、戴的状态。have on不用于进行时态。①He always wears/has on black shoes.她一直穿着黑鞋。②She is wearing/has on a red coat她穿着红大衣。(3)dress 穿；戴。可用作及物动词，以人作宾语，即dress sb.（给某人穿衣）；也可用作不及物动词。既可强调动作，又可表示状态，表示状态时常用be dressed in 结构。此外dress还可用作名词。①Mary is dressing her daughter.玛丽正给她女儿穿衣服。②She usually dresses well.她总是穿得很好。③He is dressed in a black jacket.他穿着黑上衣。(4)in 穿着；戴着。是介词，以衣物或表示颜色的名词作宾语，表示状态。构成的介词短词可作表语或定语。①My brother is in a blue jacket.我弟弟穿着蓝上衣。②The boy in a blue jacket is my brother.穿蓝上衣的孩子是我弟弟。③My brother is in blue.我弟弟穿着蓝衣服。wear “穿着；戴着”，表示状态，宾语可以是衣帽，也可以是饰物、奖章等。例如：
You’d better wear blue or black pants with blown shoes.
穿棕色鞋子的时候, 最好要穿蓝色或黑色裤子。
Why does he often wear dark sunglasses? 他为什么经常戴着深色的太阳镜？
㈢ 他穿着一件蓝外套He is dress/He is dressing / He is dressed /in a blue coat.那个对都是什么意思
正确句子： he is dressed in a blue coat 意为：他穿着一件蓝色的外套，其同意句为：he is wearing a blue coat. 而he is dress 和he is dressing都是错误用法，无意义。