I think that matte jersey, maybe not skirts, but wrap tops and dresses would be a great way to look slender, kimono dresses would also work. kimono tops. anything babydoll-ish and in some sort of knit stretchy fabric. old navy has some really fab jersey dresses and I dunno about tops… I know it sounds weird, but maybe check out some maternity style dresses, because they are meant to stretch with the wearer. this adorable dress is affordable and looks sort of high end
http://www.oldnavy.com/browse/product.do?c...;scid=417880002
this top seems sort of dressy and will work for a svelter you and a current you
http://www.oldnavy.com/browse/product.do?c...;scid=505644002
trapeze tops and dresses are versatile, and I think you can wear the same tops and just have an adjustable belt. woven belts with no holes will work for your current size. while this belt seems a little expensive, because its braided, it can keep on cinching for losing even a couple inches.
http://www.oldnavy.com/browse/product.do?c...;scid=505499022
http://www.oldnavy.com/browse/product.do?c...;scid=540921002
and knit empire waist dresses in smaller sizes can work for your currently larger belly, and look oh so chic in a drapy way a couple sizes smaller
http://www.oldnavy.com/browse/product.do?c...;scid=492965032
http://www.oldnavy.com/browse/product.do?c...;scid=480177132
http://www.oldnavy.com/browse/product.do?c...;scid=508662052
try wearing bright colored hose with neutral dresses in fall to cover your legs for extra warmth.
knee socks can be worn with a pair of grown up (no pastel colors unless you are like 15) warm colored pumps and a dress for a trendy look.
http://www.oldnavy.com/browse/product.do?c...;scid=505465012
wearing a pair of black cotton tights in a skinny jean style (not a sock knit, but not a hose knit) kind of like the tights you find in the girls section in walmart, underneath a dress or kimono top can look like skinnies, and pair of knee socks and pumps can be very cool and trendy looking. those cotton skinny sweatpants are inexpensive and usually below 10, so you can get a couple to replace the wearing of trousers or jeans, if you like. the waistbands are extensible, so they can go in.
all of the things I provided links for are all told, 88.98… just in case you wanted to know