Originally Posted by
songsc
Though I would say on routes/flights with lots if business travellers, I could be quite “noticeable” as I am often the only one not in business attire.
By "business traveler", you seem to be retricting yourself to non-technical professionals such as financial, legal, and marketing. Few if any technical professionals (at least in North America) would wear what a 20th century person would have called "business attire". That's just not the culture in the industry.