The Beady Eye frontman and ex-Oasis singer told ShortList that British style was all about "a look back over the decades", with a special focus on the 1960s, "when lads were buzzin' and defining their style".
Asked for his own worst fashion crime, the Pretty Green designer said: "It's not for me to point out.
"I'm sure there have been a few mistakes, but overall I'm cool as f**k."
On who gives British style a bad name, Gallagher replied: "Anyone who wears what they are told to wear and not what they want to wear.
"You know, the ones who have stylists. If you don't know what you look good in, then I feel sorry for you."
The singer added that Pretty Green would be opening a new store in Leeds next week, which would be followed by the brand's first international store in Tokyo in July "just before the mighty Beady Eye play Fuji Rocks".