Doskoi Panda (ドスコイパンダ, Dosukoi Panda) is a logo that appears on many things in One Piece.
According to Oda, Doskoi is a popular brand-name franchise in East Blue and its headquarters is on Mirrorball Island (which was featured in the Jango's Dance Carnival featurette alongside the One Piece movie Clockwork Island Adventure.) It is a very high-end brand and as such, it is very expensive. One shirt might cost a person over 10,000. According to Oda, a cheap fake brand, Dosko1 Panda (ドスコ1パンダ, Dosuko-Ichi Panda), also exists.
Oda later in the series also gave the name of another fake brand, Cyberpanda. Although fake, it is far more expensive than the original Doskoi brand.