LIZ JONES FASHION THERAPY: Knee-high boots are all the rage again. But why do they make my legs look so darn fat?

On trend: Knee-high boots from Gucci autumn/winter 2011

On trend: Knee-high boots from Gucci autumn/winter 2011

Carvela bikers from Selfridges, 200: These are really soft, and give a bit of height

Carvela bikers from Selfridges, 200: These are really soft, and give a bitof height

Stiletto-heeled long boots with buckle by Karen Millen, 258, Asos.com

Stiletto-heeled long boots with buckle by Karen Millen, 258, Asos.com

Over-the-knee flat Cheryl boots by Asos.com, 75: Great for work, as they are smart but comfy

Over-the-knee flat Cheryl boots by Asos.com, 75: Great for work, as they are smart but comfy

Motorcycle boots from Topshop, 105: Comfy and well-made, with a nice, wide calf

Motorcycle boots from Topshop, 105:Comfy and well-made, with a nice, wide calf

Black leather bikers from Debenhams, 159: Good width for the fuller figured

Black leather bikers from Debenhams,159: Good width for the fuller figured

Mid-heel boots with round toe by Dune, 129: These work with eveningwear and eight denier black tights

Mid-heel boots with round toe by Dune, 129: These work with eveningwear and eight denier blacktights