The Butterfly outfit is a cosmetic reward from the Tribute to Guthix event released on 12 March 2013. All 3 pieces were obtainable for free from Memstix during the event, along with the Sword of Edicts and the Butterfly Dervish emote.
Memstix now gives all pieces away for free, in addition to the Sword of Edicts and Butterfly Dervish emote, warning that a time of imbalance is approaching.
Wearing it drastically increases the chances of catching a Guthixian butterfly.
It consists of 3 pieces: