This one is from tom, who was also involved in the original video. This design is all clear skies and rainbows! 
— Website description[1]
reverse rainbow (逆さまレインボー Sakasama Reinbō?) is an Outfit for Hatsune Miku.
Description[]
The Outfit's attire consists of a long white collared coat with teal inner-fabric and gray stripes on the collar and end sleeves, and a teal bow on the back, a teal necktie with a yellow droplet clipped on, a white dress with light and dark gray stripes on the bottom and two upside-down triangle cuts revealing teal fabric, teal three-finger rings with a white flower on both hands, and black boots with teal stripes on the openings and teal soles. Additionally, Miku wears white headphones with a rainbow on each of the side handles and eighth notes (♪) on the earpads.
Game appearances[]
The Outfit first appears in Hatsune Miku and Future Stars: Project Mirai where it can be unlocked after watching the PV for "reverse rainbow" and can be bought for 5000 Mirai Points. It returns in Hatsune Miku: Project Mirai 2 and Project Mirai DX where it can be unlocked by clearing the aforementioned song on any difficulty and can be bought for 5000 Mirai Points in Project Mirai 2 and 3000 Mirai Points in Project Mirai DX.