If you want an answer.
People are asked to attend these rally's/protests in uniform or items that resemble the industry that they worked in.
As for him wearing a pilot uniform any place in public - I personally see no issue UNLESS he is wearing employer logo items (such as wings). I see all over the place pilots in uniform obviously, 1 item removed when drinking.
Is he still a pilot?
The numbers were pretty big in Canberra, takes a lot to facilitate that size of event, for what seems about a week now. Truckers in Ottawa (massive numbers) certainly have out played the police force there & had zero concern when GoFundMe pulled the $9M donations.
I would have money on Mr Hood getting a seat at the table with the PM for discussions this week, I doubt any other here on Pprune will get an invite.