Image imported from derpibooru
Original Description:

Trixie finished putting on her jacket and took a moment to make sure mane still looked the way she wanted it. With that completed she called out to her partner.
“Starlight! Trixie is ready to leave whenever you are.”
From their bedroom Trixie heard. “Be there in a sec. Just need to grab a jacket!”
Trixie picked up her purse and retrieved her phone from it. She was looking down at when Starlight came walking into the foyer. Still looking at her phone Trixie addressed the mare.
“Okay. Twilight has messaged Trixie to let her know that Page Turner, Rarity and Sunset will be joining tonight but…….” Her voice tapered off as finally saw what Starlight Glimmer was wearing.
Starlight was wearing a glossy, skin tight, high neck, vinyl leotard with matching thigh-high vinyl boots. Keeping them company was a puffy short jacket of light aqua. For several seconds Trixie said nothing. Then she spoke.
“Trixie wants to know what Starlight is wearing and where she got it?”
Starlight cocked her hips and smiled. “Well. Minus the jacket. This is going to be my new stage assistant outfit for when I’m helping you with your performances! Remember you asked Rarity to design one for me? You said you wanted something that would occasionally distract the audience by having me be a misdirection. So. Is this distracting enough?”
Trixie had discovered she could see her curved reflection on Starlight’s chest. It took a second for her to reply. “Oh! Yes! Trixie thinks this will be…but Trixie is a bit surprised that Starlight is going to wear this in public? Ponies will be looking at you….a lot.”
Starlight bit her lower lip a little and then shot Trixie an impish grin. “Yes. But I’ll be wearing this in public when I’m on stage, and they’ll definitely be looking at me then! Besides I know Rarity wants to see Twilight’s and Page’s response to it! So let’s go or else we’ll be late.”
Recently a friend of mine showed me an image of gloss black leotard type garment that someone had posted to a Discord they belong to. They commented that they could see certain certain characters wearing it as part of an outfit. Well my subconscious took the idea and ran with it, and this little bit of dialog and image popped up in Anthro MLP dreamscape last night.