大牌定制衣服的英文翻译可以是：Custom clothing by a famous brand.

来源：大牌在这里指的是那些有名气的品牌，而定制衣服则是指根据客人的需求特别制作的衣服。

例句：

I want to get a custom suit from a famous brand for my wedding. 我想为我的婚礼买一套大牌定制衣服。
The custom clothing by famous brands is often more expensive than regular clothing. 大牌定制衣服通常比普通衣服贵。
She always wears custom clothing by famous brands to important events. 她总是在重要场合穿大牌定制衣服。