我想成为服装设计师用英文怎么说

"I want to become a fashion designer" 是表达想成为服装设计师的常用英文表达方式。

其中，"I want" 是表示“我想”的常用英文短语，"to become" 是表示“成为”的动词短语，"a fashion designer" 则是表示“服装设计师”的名词。

例句：

"I've always wanted to become a fashion designer." (我一直都想成为一名服装设计师。)
"I'm determined to become a successful fashion designer." (我决心成为一名成功的服装设计师。)
"I'm studying fashion design in college so that I can become a fashion designer." (我在大学里学习服装设计，目的是成为一名服装设计师。)