Oh, me too, Mulberry! I'm not particularly heavy, but I am a Type C (pear), so it took me a while to figure out how to style them in a flattering way. Once I figured out which tops worked well (length, cut, shape) after lots of experimenting, I found that yes, they really are slimming! And yes, dark colours -- I've got skinny jeans in dark rinse, forest green, and just picked up a pair in dark purple. Leggings are great for winter, though I usually wear them under skirts/dresses rather than tunic tops...maybe that's a way you could try them out?