上周日妈妈给我买了件漂亮的衣服。

[camboron]

[details=“English Translation”]My mother bought me a pretty clothes this past Sunday.[/details]perhaps [bought me SOME pretty clothes

[tod]

[details=“English Translation”]My mother bought me a piece of pretty clothes last Sunday.[/details] yeah “some” is a way better translation than “a pretty clothes” or “a piece of pretty clothes.”

Perhaps also no “件” and just “pretty clothes.” Or “一件连衣裙” “a pretty dress”