I’m more worried that Sleepyhead seems to only have one pair of pyjamas (unless she has multiple pairs of the same). Personally I think it is a good idea to get dressed every day but that is a personal choice.
Seriously – query what is inappropriate, if you were wandering around in a g-string and nothing else, yes that may be inappropriate. In the absence of a by-law setting out specifically what is appropriate, they don’t have a leg to stand on. There is a very funny case on this, about a community in Tweed Heads.
The OC can’t fine you, they would have to take you to the CTTT to do that. They also don’t have the power to evict you, your contract is with the landlord and I doubt they would do that.