How can one describe the shape of fire? How can one convert this element into abstract fashion design elements?

It is common for fashion designers to take inspiration from nature. Fire is an unusual element to consider in this way since it does not really have form, even though it is visual. Its shape is always moving, and if it stops moving it stops burning. What it does have is energy, and color, and these two aspects can easily be translated to fashion design elements.

The energy of fire can be interpreted with emotional...

It is common for fashion designers to take inspiration from nature. Fire is an unusual element to consider in this way since it does not really have form, even though it is visual. Its shape is always moving, and if it stops moving it stops burning. What it does have is energy, and color, and these two aspects can easily be translated to fashion design elements.

The energy of fire can be interpreted with emotional concepts, which are also commonly used in fashion design. Passion, heat, aggression, sexuality, all of these correspond to fire and can be suggested in a fashion design. One interesting example of the use of the fire element in fashion design occurs in the book and the film adaptation of The Hunger Games. Katniss is to wear a gown designed by Cinna, and he wants to capture the element of fire for her personality, since her district is the one of coal. The undergarment is a black leather catsuit (the black leather being reminiscent of the coal) but the top is a cape that will be set on fire during the performance/presentation before the games begin. 

The colors of fire are usually the warm colors of red, yellow and orange, but one can often see traces of blue, violet and even green in fire at times. Fire is the element associated with the astrological signs of Leo, Sagittarius and Aries, so these symbols could also be used to interpret the idea of fire in a fashion design. Sagittarius, the Archer, carries a bow and arrows like Katniss. The sign of Saturn is ruled by the planet Jupiter, the largest planet in the solar system, associated with travel, learning and adventure. Leo, the Lion, is ruled by the Sun, associated with youth, beauty, courage and vigor. Aries, the Ram, is ruled by Mars, planet of war and aggression, and is associated with boldness, confidence, initiative and action.