This is a recent discovery so I don't know if its exclusive to jRO or not, but thats where I found this data at. Today I present to you yet another costume job I found and it shocked me to see this.
Costume Class - Summer (Or Summer 2 if you wanna call it that)
No your not seeing things. Its another summer outfit and a really good looking one too. Information
Job ID - Tag and ID confirmed
SUMMER2 = 30
OPTION Mask - Unknown, but its likely this since all costume outfits require one....
*Edit* - This is confirmed to not exist. This outfit and future outfits use a status ID and a value to display. Check post below.
OPTION_SUMMER2 = 0x20000000
Note: To the dev's, I don't have any data on the official mask but ill let you know once I get a confirm on it. Its gotta be this one since nothing else came out that would require one after the Oktoberfest one was added.
Summer 2 Sprite Files
Summer2 Sprites.rar
The patch file the sprites were found in is dated July 22, 2014 which means we likely need a client of that date or higher to see it in game. Enjoy.
