I need some smart work trousers to wear with different jackets for the spring/summer - I have long slim legs, a flat bottom but am an apple shape with a round tum!- so most trousers that are comfortable round the waist are gaping and saggy below the bum and on the thighs - want some straight or skinny leg but not jeans or leggings - - that can work with heels or flats - - anyone of you marvellous fashionistas know of anything to suit?? 