Iru received a redesign from her original, SUGURI, outfit in 2018. She previously wore orange cargo shorts and two sleeveless shirts. Her last appearance in her classic outfit was in Acceleration of SUGURI 2.
Her new design was originally revealed by Hono on Twitter on March 13th, 2018, roughly one year before her release.[1]
She doesn't like being mistaken for a boy because of her body shape and personality.[2]
Iru in Acceleration of SUGURI 2
Iru from Hono's Twitter
Long-Distance Shot and 
Extended Photon Rifle.