I was in the SYD QP on the 01/01 and there was someone who has wearing a wife beater (aka, blue singlet that has seen better days), pair of rugby shorts that were at least 10 years old (and both had holes the size of golf balls throughout) and a pair of thongs that look like he'd found on the beach. This guy looked like something out of Cast Away. That was a little bit too relaxed IMO.
Personally;
shirt, without holes/torn
shorts, without holes/torn to shreds
Would be a little bit too relaxed. But, that's just me, so please don't shoot me down for that. I understand that ALOT (l would say, at least 80%) of people get QF SG or WP through work travel, but l paid for my QP (through work corp scheme) and if l paid for something l expect that QF would at least have standards. I don't mind if people have "Hawaiian” shirts or "loose" standards, but don’t let people in that look like they crawled out of a garbage bin.