I third the boob thing. I like shirts that allow for a full coverage bra, but don't look matronly. Another thing I've noticed is that alot of plus size clothing seems to be made of light weight, gauzy fabrics with little shape. I need structure!!
It's hard to find nicer quality fabrics and prints. I want my clothes to look lilke they're from the regular size departments, just proportioned to fit a bigger girl's body.
Since you asked, I wear a 16-18 tall. I'm short waisted, large through the bust, and carry most of my weight in my belly more so than my hips. I'm definitely an apple, not a pear!!