Question

Ma soeur et moi achetons de robes pour or printemps

Answer 1

Hi,

Correct : Ma soeur et moi achetons des robes pour le printemps.

Answer 2

Hi! 
If you are wondering, the correct way is supposed to be "des" (before robes)
Or...
if you want to translate, then... "My sister and I buy dresses for spring gold."