The main floor.

As they crossed the breezeway into one of the main con hotels Grace felt herself go flush and then a burning blush appear on her cheeks, and at her waist. They had taken the elevated sky-bridge over the street rather than brave the crowds outside. So they had a birds eye view from the side of the second floor.

The crowd was gigantic! People milled about having conversions or else took pictures. The most eye catching cosplays caused a little ripple in the crowds as several photographers made a wall of people and most people avoided walking in the middle of the shot. These bubbles dotted the main floor below.

Grace couldn't believe she was about to be out there in the thick of this in nothing more than she was wearing. She was beginning to second guess her decision to remove the underwear. When she received a gentle tap on the shoulder. Someone was dressed as Padme Amedala and wanted a picture with her "daughter". Grace was happy as always to pose ended up going through 2 different people and 4 different cameras before all was said and done. Her eyes glazed over from the flash. Blinking the two made their way around the floor and familiarized themselves with what this building had to offer. There was a tabletop gaming room in the basement, a foodstand and lobby on the ground floor, then a second full floor of panel rooms, plus the rave was held in the biggest ballroom on this floor. and there was a cocktail party overlook platform with a few tables and a bar that served as a third story balcony overlooking the other two. The second floor being a crescent shape allowing you to see the ground floor below. All of this inside a hollow hotel with rooms lining the outside edge of the building and going up 30 stories or more.

Grace was on cloud nine, her costume was getting so much attention. And pretty much everyone was being amazingly supportive, telling her how brave she was, wanting to pose with her.

Part of Grace felt like she should be embarrassed but the anti-depressant and fresh shot of tequila (number 3 for the day) in her system kept her riding the attention wave with nothing but positive vibrations.

In fact she found herself quite enjoying the experience to the point of mild frustration. The rush of her near nakedness, being just barely hidden from so many. And **** always raised her libido. She quickly became more daring with her poses. Trying to ease out this naughty feelings bubbling up within her.

She found herself aware of every brush of the metal plate that served as her only real cover, as it slipped and slid around teasingly. She normally kept a landing strip but with the low hang of this half skirt bottom she was for the weekend at least fully shaven. She kept having to stop herself from running a finger along the smooth patch of skin directly between her hips. She told herself it was just to check everything was still in place, after all There was an army of camera's facing her everything had to be just so if she was to keep her dignity.

But when she caught herself subtly grinding her hips into a rather built fellow in a Spiderman bodysuit she realized two things, she might need to take a break, and Spiderman wasn't wearing a modesty belt...oops.

She remained oblivious to the effect flash photography had on her barely there anyway coverings, and the fact dozens of strangers now had photos of her in little more than the tint from a red pair of sunglasses.
It might sound strange no-one would mention such a thing. Of course but who wants to be the perv who ruins the fun and tells the girl "hey did you know your costume is see through?" There's a culture of protection and safe space around cosplay. If this girl wanted to basically streak the convention all day that was her business. Either she already knew and you're a pervy jerk for pointing it out and ruining the fun, or she doesn't... and then you'd be surprised how many people just want to whisper about that possibly when it comes to a girl as pretty as Grace. So with a combination of factors Grace avoided the realization she was essentially naked in the crowd, the small plate causing her so much frustration her only real form of protection, avoiding a clear full shot from the front.