For me it is the sexy office secretary!! OH would go with fireman (or probably any uniform).
Don’t know what others think, but for me, the more ‘genuine’ the costume the better! I always feel if you have to put a prop or something on the costume to confirm what it is meant to be detracts from it! Want it to be as if fantasy is really coming true.
I am all for fun and laughter but don’t want it too ‘silly’!
Totally get what you mean @Buzboy. When I was a little girl, I wanted the toy hoover that looked like a real one, not the pink plastic one. Same now as a grown up with costumes.
Secretary (black lingerie, naturally) and nurse are good but masquerade ball mask is another one, always fancied going to a party like that. Been watching too much porn maybe…
Ooh, yes secratary is a good one. Sexy librarian is awesome too
For him, some easily removable overalls and some black, grease like, body paint. 
I’ll think of a way to pay the mechanics bill.
Some of the men’s outfits are little camp for my taste, I do love him in some of the LH boxer/hot pants though.
Tight jeans and a white t shirt still does it for me.
I think to see the OH dressed as Catwoman (but with a few cutouts here and there) would be amazing, I’d be ‘feline’ great about that 
Princess Leia slave outfit is the one fantasy role play costume I’d love my OH to wear 
Currently have my eyes on a few things in the store so hoping there’s a costume deal around halloween 
A PVC maid, PVC nurse, and nurse
I love PVC stuff so anything wetlook does it for me I agree with @Peitho, want a full proper Playboy Bunny type outfit but my boobs are quite small, so I’ve pieced one together from separate bits 
I second @digdog2001, a full proper catwoman type suit would look so nice as well Not super into roleplay but I think animal dress-up is always cute to sexy depending on the type 
I also second all the Mrs. Claus comments I’ve seen some PVC ones on other sites and they look so gorgeous
For me probably more of a witchy vibe. Corset, all black, almost feral feel. Or the COMPLETE opposite with a more risqué women’s business attire. Very form fitting skirt and blouse that can unbutton to show off cleavage, matching bra and panties, but with red-bottoms.
For him, it’s not even a costume but anytime he’s just well put together. Black dress pants, white shirt with the sleeves rolled up. Bonus points if it’s a suit.
Secretary / Professional Business woman / 1940’s Pin Up or services uniform
Eyes Wide Shut Venetian ball style
Wonder Woman / Princess Leia
A sexy star trek outfit would be lovely. More next gen than classic though x
For me it’s vampires. The old school type. Not dracula but more interview with a vampire. Vintage clothing, long flowing coats etc. I love the fantasy of it though and wouldn’t act it out as if it wasn’t up to what I have in my head it would dissapoint me 
I’d love to see matching his and hers kinky superhero costumes - save the day, in a sexy way!
Some ideas:
Super Slut
Monster Dick
Ball Blaster
Ass Invader
Bad Bitch
Toxic Cock
It would be good to mix some materials together so pair some lycra with lace or PVC with satin for a funky new look too.
@Cupc8kes I’ve been working on a Super Slut costume for a while now. Only in the design phase as yet, but since my Supergirl went down so well, I’m working on this. Thigh length leather boots are a must I think - good excuse to have to buy a pair.
How about Army costumes?
It could range from WW1 costumes through to 1940/1950s smart look, right up to current styles.
Yesssssss, why wasn’t this my first answer? Hard to argue with the 1960s miniskirts from the original series though.
Agreed, super hero’s sound good. Always loved the super hero shorts and suspenders they had in the store for a while and always wished it came with a too half. Kick ass boots are a must 
@Green_Eyed_Girl - i was lucky enough to get my wife the Batman ones. I think they can be hotter than a lace red number.
The missus loves to be a maid or nurse , both LH outfits , but her favourite ( and mine ) is as a mistress in a LH wet look bustier
https://www.lovehoney.co.uk/sexy-lingerie/lingerie-sets/basques-corsets-bustiers/p/coquette-darque-wet-look-half-cup-basque/a38106g70445.html, pearle thong , stockings .
Maybe 7 of 9 catsuit.