The difference between a 200 kg fat man wearing 600 g and 500 g Barbie pants depends on his body shape and wearing experience. Heavier Barbie pants can provide better support and shaping effect, while lighter Barbie pants are softer and more comfortable. For a fat man weighing 200 kg, there are many factors to consider when choosing the right Barbie pants, including the material, elasticity and tailoring of the pants.