how seriously do you actually take costume themed club nights, full effort or polite nod

silly question maybe. on the scene about 2 yrs, both early 40s, glasgow, and weve done a few themed nights at our local club and a couple of takeover weekends. and the spread of effort is bonkers. like at the "venetian" night last month half the room had clearly spent money on proper masks and outfits and the other half rocked up in regular underwear with a sort of half-hearted eye mask from amazon. we sit somewhere in the middle. i make a bit of effort, hell wear whatever i tell him to wear. but we got to one a couple months back where the host couple had clearly invested in proper costume and i felt a bit naff turning up in basic black and a mask thats clearly £4. like under-dressed-for-a-wedding kind of energy. and at the same time i dont want to be the couple at a swingers club thats taking the theme more seriously than the sex, you know. i guess my question is whats the etiquette. is making an effort with the theme a signal to other vet couples that youre in it properly and the ppl who turn up basic are seen as low effort. or is the theme just a fun thing on top and the actual play is what matters and we're overthinking the costume. and where do you actually buy decent club-night themed stuff in the UK / ireland without resorting to fancy dress shops that smell like a stag do