Right, I will start you off (and keep this bumped a bit)
"20
5'2"
16
Hourglass"
What shops do you like? Whose style (if any) do you admire?
My first advice is always to get some fab accessories because you can wear them with anything and it automatically looks like you have made an effort. Big dangly necklaces are great, unusual scarves if you can get away with wearing them, a cool pair of boots at this time of year. You can wear any old jeans and t-shirt with some funky jewellery and it instantly looks better.
Accessorise have lovely things but quite pricey - Matalan, and bizarrely Sainsburys, have cheaper stuff.
Be bold and get something striking - a hat, some patterned tights etc. They can make you feel much better even about quite an ordinary outfit.