The actor, 77, amused fans as he strutted onstage in a pinstripe shirt, camel-hued leather trousers and vibrant brogues.
The star also suffered an unfortunate wardrobe malfunction when he took his seat, with his trousers riding up and flashing his lower legs.
Amused fans took to social media, with one writing: ‘Fire your stylist, expeditiously’ while another typed: ‘Brian Cox is “do whatever I want” years old.’
Others typed: ‘This fit is nuts man lol’, ‘What is this fit’ and ‘Imagine Logan Roy getting told to wear those pants on a talkshow.
Oh dear: Succession star Brian Cox was roasted over his ill-fitting leather trousers after a recent appearance on The Tonight Show With Jimmy Fallon
Another follower wrote: ‘This fit is nuts man lol’
The star recently admitted he is mourning the loss of his privacy with his celebrity status and told how it was very ‘important’ to him.
Brian told The Guardian: ‘I’ve lost my anonymity, and I’ve realised that was what was important to me.
‘I haven’t ever experienced anything like this. I mean, you ask for success in your work, and you get it, and then you have to deal with the consequences.
‘I’ve always valued my privacy, but it’s gone. I’ve been very lucky that I’ve had it for so long.
‘You know, I’ve been doing this for over 60 years. And finally it’s over.’
Brian also told how he has turned down other roles in huge blockbusters including Game of Thrones and Pirates of the Caribbean.
He revealed he was offered the role of a king called Robert Baratheon in Game of Thrones but turned down the role because the money wasn’t good enough and the character got killed off early.
Interesting: The actor, 77, amused fans as he strutted onstage in a pinstripe shirt, camel-hued leather trousers and vibrant brogues
Lol: Amused fans took to social media, with one writing: ‘Fire your stylist, expeditiously’ while another typed: ‘Brian Cox is “do whatever I want” years old
Banter: Another fan wrote: ‘Imagine Logan Roy getting told to wear those pants on a talkshow’
It is not the first time that Brian has spoken about losing his anonymity since starring as the billionaire patriarch of the Roy family in Succession.
Brian secured a Golden Globe for his role, but told Barley Magazine that his success has come with a price.
Earlier this year, he explained: ‘It’s been a phenomenal journey for me. There’s no question it’s changed my life in so many ways.
‘I’ve lost my anonymity, you know, I’ve lost all of that. That’s all gone. I used to be the guy you’d say ‘Oh, you were in such and such or no, or no you weren’t’….but now I’m Logan Roy and everybody just wants me to tell them to f*** off!’
He discussed how fans commonly ask him for ‘f*** off selfies’, saying: ‘I say they can have one for $500.’