A person whose clothing size falls within the standard size range offered by most clothing stores. In the U.S., straight sizes typically range from 0 to 12, though some brands extend this to a size 16. Sizes 12 through 18 are sometimes considered mid-sized, while size 20 and above is generally considered plus-sized. These ranges my vary by brand and region.
As a plus-sized person, I can not shop for clothes in most stores. My straight sized sister has a smaller size than me. Most stores carry her size.