Found these in a mag. Hope they help.
Bootleg or wide leg pants
A-line or fluted skirts
Dark colours on the lower half
Longer line jackets
Tops that sit below the waist
Darker colours on the bottom half (no white!)
Trousers with a wide waistband
Wrap-around or low-waisted tops
Heels - the higher the better
Trousers or jeans that fall to the bottom of the heel
FULL FIGURE FLATTERERS
A-line skirts that flare at the waist
Personally, I've found 3/4 length pants make me look short, stumpy and fatter than I am (may differ for those over 160cm), anything that stops at my waist makes my butt look twice as big and baggy clothes top and bottom make you look bigger than you are.
I also read that good posture will make you appear slimmer - I'm walking around with a book on my head from now on!