Sorting

Hang all the clothes in the blue category

Hang them by category, then colour;

Tops, skirts, trousers, shorts and dresses.

Tops;

Red, orange, yellow, green, blue, purple, black, grey, white.

Skirts;

Red, orange, yellow, green, blue, purple, black, grey, white.

Trousers;

Red, orange, yellow, green, blue, purple, black, grey, white... etc