all kinds of cotton fabrics are used in quilting- just like all kinds of fabric are used for appairal...as long as it is quality- not so thin it's see through you certainly use it for what ever you want...many many people have no idea there is such a thing as (quiting cotton)lots of us have been sewing for many many years and until the recent serge in quilting interest there was no distinction between the cotton fabrics- we did not have quilt shops we had fabric stores, and you bought cotton, polyester, wool or rayon for most of your sewing projects- did not matter if you were making a sun dress or a quilt...
the manufacturers figured out 10-15 years ago that they could market their cotton fabrics as (quilting cotton) and expand their market.