Ball-gown fabric, which is typically used for formal attire, can be described using several different synonyms. One option may be to call it "formal dress fabric," as this term conveys the idea that the material is used specifically for special occasions. Another option is to use the term "satin fabric," as many ball gowns are made of this smooth, shiny material. "Chiffon fabric" may also be applicable, as it is commonly used for flowing, elegant gowns. Finally, "lace fabric" could be a synonym for ball-gown fabric, as lace is often incorporated into formal attire, adding a delicate, intricate touch.