Hello ,
I'm not a real fan of Kirby games so i didn't had any ideas for original alternate costume, so i just made the colors that appeared in Super Smash Bros Ultimate.

References:
Purple: Resembles Meta Knight unmasked.
Yellow: Based on and directly referred to as "Keeby" from Kirby's Dream Course.
Blue: Based on Ice Kirby in Kirby Super Star. It also resembles Blue Kirby from various Kirby titles.
Red: Based on Fire Kirby in Kirby Super Star. It also resembles Red Kirby from various Kirby titles.
Green: Resembles Green Kirby from various Kirby titles and Plasma Kirby in Kirby Super Star Ultra.
White: Resembles his monochromatic in-game sprite from Kirby's Dream Land.
Orange: Resembles Suplex Kirby, as well as Kirby's appearance after using Orange Spray Paint in Kirby & The Amazing Mirror and Kirby: Squeak Squad.

Okay. I found a few things wrong with this.

1. The Blue Kirby does NOT reference Ice Kirby, because Ice Kirby doesn't have blue feet. It actually resembles Kirby's Ocean Spray Paint.

2. The Red Kirby doesn't reference Fire Kirby, as Fire Kirby takes on the same appearance as regular Kirby.

3. Suplex Kirby is brown, not orange.

Other than these three minor errors, I think you did a good job!

Thanks , i just took the description from the official ssbu wiki

Both Fire is red and Ice is blue in super star ultra

You may be correct, but Ice Kirby has lavender shoes in Super Star Ultra, not blue. Fire Kirby is basically a little darker pink with a red tone on it.