For your reference for sizing: I am 48 inches in the bust, 42 inches in the waist, and 48 inches in the hips. Roughly an M in City Chic. I'm 6ft (184cm) tall, 120 kg.
Target:

Whilst there is a (depressing) dedicated plus size range, most of the cute stuff from the straight size range sizes out at 18/20. Depending on the cut, the 18s and 20s fit. I wouldn't buy online -- the fit is pretty inconsistent from item to item. Target do have sales very regularly, and things get marked down to clearance frequently making it super affordable. Overall, this is my preferred budget line.
The tops are on the shorter side.
I'm wearing an 18 in these items right now:
http://www.target.com.au/p/active-performance-tank-diva-pink/57910024
http://www.target.com.au/p/double-layer-top-coral-black/57806518
http://www.target.com.au/p/active-racer-back-tank-black-diva-pink/57845913
I'm wearing a 20 in these:
http://www.target.com.au/p/t3-strap-back-t-shirt-black-pink/57809588
http://www.target.com.au/p/active-low-back-tank-black/58157008
Even though the tops can be short, I do prefer them over Target leggings in general. I find the leggings to have thinner material, and the printed leggings show the white backing when stretched. However, there are some real gems out there, that are equal parts comfortable, durable, and cute.
http://www.target.com.au/p/giaan-by-spalding-scoria-3-4-leggings/58176429