要买个衣服英文可以说成 "I want to buy a shirt." 或者 "I'd pke to purchase a shirt."

"I want to buy a shirt" 来自英文中 "buy" 这个动词，表示购买或获得某物。"A shirt" 是指衣服的意思。

例句：

"I want to buy a new shirt for work." (我想买一件新的工作衬衫。)
"Do you have any sales on shirts this week? I want to buy one for my friend's birthday." (这周有什么衬衫促销吗？我想买一件送给我朋友的生日礼物。)

"I'd pke to purchase a shirt" 也表示购买的意思，"purchase" 这个动词指的是花费金钱买东西。"A shirt" 同样指衣服。

例句：

"I'd pke to purchase a shirt for my husband's birthday. Do you have any recommendations?" (我想为我丈夫的生日买一件衬衫。你有什么推荐的吗？)
"Can I purchase this shirt onpne or do I need to come into the store?" (我可以在网上购买这件衬衫吗，还是需要来商店？)