他穿小号可以用英文表示为 "he is wearing a size that is too small for him" 或者 "he is wearing a size that is too small on him."
"Wearing a size that is too small" 这个短语的来源可能源自于人们在购买衣服时常常需要确定合适的尺码。如果某人穿的衣服尺码太小，那么这件衣服可能会很紧，不舒服或者不合身。
下面是一些例句：
"He tried on the shirt, but it was too small for him. He needed to go up a size." (他试穿了那件衬衫，但是太小了。他需要换一个大一点的尺码。)
"She reapzed that the dress was too small when she couldn't zip it up all the way." (她发现这件连衣裙太小了，因为她拉不上拉链。)
"He wished he had gotten a larger size when he saw how tight his jeans were on him." (他看到自己的牛仔裤太紧了，希望自己买的尺码大一些。)
"Wearing a size that is too small" 这个短语的来源可能源自于人们在购买衣服时常常需要确定合适的尺码。如果某人穿的衣服尺码太小，那么这件衣服可能会很紧，不舒服或者不合身。
下面是一些例句：
"He tried on the shirt, but it was too small for him. He needed to go up a size." (他试穿了那件衬衫，但是太小了。他需要换一个大一点的尺码。)
"She reapzed that the dress was too small when she couldn't zip it up all the way." (她发现这件连衣裙太小了，因为她拉不上拉链。)
"He wished he had gotten a larger size when he saw how tight his jeans were on him." (他看到自己的牛仔裤太紧了，希望自己买的尺码大一些。)