There is Blue Gi's and Blue belt ( 6th belt )
white belt
White.
The belt colors in least to greatest are: white yellow orange green blue purple brown black
blue
Obi in Japanese means belt and the colour order is White Yellow Orange Green Blue Brown Black Red And White
bluegrey... (If that is even a color)
Blue then green then orange then yellow
The belt order goes as follows: White (Single Wide) Yellow Orange Green Blue Purple Brown Black (1-5th Dan) Red and White (6th-8th Dan, Most Still Wear Black.) Solid Red (9-10th Dan) Double Wide White Belt (12th Dan, has never been awarded. Perfection has to be attained before receiving this belt, and perfection is not possible. The Kodokan, and other judo organizations have the power to award this but never have.)
Grey is not a color of judo . White and blue colored gi(dress),and belt color may different .
It depends, for the Senior fighters, the second highest colour belt is brown, but the second highest belt is actually your 9th black belt (9th dan, this is pretty much knowing every throw, and only one person has ever reached it) Juniors, the second highest belt is blue, after brown, as you cannot be a black belt junior. :D
White, White-Yellow, Yellow, Yellow-Orange, Orange, Orange-Green, Green, Green-Blue, Blue, Blue-Brown, Brown, Black, Red-White, Red