Hey, I was in the JLounge at SYD last week, with a companion who was not travelling (*sigh*, I know it isn't allowed, but I can talk a lesbian into having relations with a queen, so this was no big drama), and she was in steel-capped boots, jeans, and a polo shirt - I was in the gear required for my flight. It was no big drama though, both of us got into the JLounge (even though I was the only one flying) and we had a good time.
Better than the QP though, better catering (as far as hot food goes) - and this is on a Sunday.
Dave