Doskoi Panda (ドスコイパンダ, Dosukoi Panda) is a logo that appears on many things in One Piece.
It is the One Piece version of the Acme company from Looney Tunes, in the sense that it appears on all kinds of items from shirts to footballs. It is also another one of the things Oda puts in his manga for fans to spot (much like Pandaman).
According to Oda, Doskoi is a popular brand of franchise in the East Blue and its headquarters is on Mirrorball Island (which featured in the Jango's Dance Carnival featurette alongside the One Piece movie Clockwork Island Adventure). It is a very high class brand and, as such, is very expensive; one shirt might cost a person over 10,000 Beli. According to Oda, a cheap fake brand, Dosko1 Panda (ドスコ1パンダ, Dosuko-Ichi Panda), also exists. 
Okome is one of the many of the Doskoi Panda Rice.
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.