Prom-style polka dots, buttercup yellow brocade effect and whimsical blue are three Christmas party frocks all for less than £20 each. Yes, I said less than twenty squids! The polka dot mini prom dress from ASOS is in the clearance at only a tenner in red and white or blue and white, and even comes with detachable straps. The yellow fitted dress with a belt is from Love Label and is £18 in the sale. Finally, the blue one-shoulder number with satin ribbon trim is yours for £15 at Stay tuned for loads more party dresses in the coming weeks!