Clara Oswald in the morning

An insistent buzzing brought Clara Oswald back to consciousness, the attractive young brunette woman rolled over in bed, slapping at her phone until she managed to silence the alarm. She groaned as she sat up in bed and squinted at the time.
"Oh, shoot." She said to herself as she realised she had slept through her 'time to wake up' alarm, her 'seriously, get out of bed' alarm and had only been woken by the 'you'll be late for work if you don't get up right now' alarm. She had only gone to bed a few hours ago, having been out with the Doctor on Azagar Prime at their chocolate and bakery festival, then once she was brought back to her flat at 3am she was officially 'part of events' and just had to put up with how little sleep she got.
After a quick wash and applying make up, although still feeling so full from the festival she could safely skip breakfast, Clara turned to getting dressed. She pulled on a white blouse with a blue diamond pattern, began buttoning it and then paused as she began to struggle to close it over her midriff.
"What the heck?" Clara muttered as the cotton stretched tight over her body, "did this shrink?" after struggling into the blouse Clara pulled a pair of dark blue trousers up her legs, pausing as they struggled to get over her bottom, then finding the fastenings wide apart from each other. "These as well? I do not have time for this!"
Straining to get herself into her clothes, Clara thought back to the various sweet treats she had indulged in the day before. The Doctor had warned her that they might have an effect on her figure, but she had not thought it would be this sudden or this dramatic! She poked ruefully at her belly, before again yanking at her trousers and sucking herself in as much as she could.

Five minutes later Clara left her flat, walking rather awkwardly for fear of bursting out of the outfit that she had spent so much effort squeezing herself into. Fortunately the lift was working so she did not have to struggle down the stairs, and she could just hope that the fabric would relax a bit and adjust to the strain she was putting on it.

"All right, class, settle down." Clara announced as she walked into her classroom, "Good morning, everyone, I hope you all managed with the homework, were there any questions?"
"Why are your clothes so tight, Miss?"
"Questions about the homework, Courtney." Clara sighed. "Everyone get out your books and we'll continue our work on..." she turned to the board and quickly wrote out some chapter numbers, she heard whispers and hushed laughter behind her. She gasped and reached to the seat of her trousers, finding it still intact but the laughter got louder as the pupils realised what had been going through Clara's mind. "Chapters seven to nine." Clara finished, turning back to the room full of teenagers, "I'll come around in a bit to see how you're getting on."
The class got to work, casting occasional glances at Clara. The young teacher began to let out a breath, but as she felt her blouse pressing against her middle she decided to try and hold it instead.
"Miss?" a girl put her hand up, Clara went over and stood by her. "I don't understand why she says this." the student pointed to one of the passages in the book they were studying.
"Okay, yes, that can be confusing." Clara replied, "But think about what happened in the previous chapter, and where she's coming from."
"Doesn't she come from Shropshire, Miss?"
"Berkshire, actually, but no-" Clara walked to the front of the class again and picked up a chalk, "Right, listen up, is anyone else confused by the party scene?" Most of the class looked up at her, some nodded, "All right, so what do we know about the social class of the characters?" Clara turned to the board and found a space to write in, "We know that... Whoops!" The chalk broke as she put it to the board, the largest piece falling at her feet, "Hold on..." Clara quickly bent to retrieve it, then as she felt her trousers straining she wished she hadn't.
SCHRRRIIIPPP!!!
"Oh, my god!" Clara gasped as the tearing noise rang out and her trousers split open, revealing purple lace underwear.
The class exploded with laughter and Clara jumped upright, spinning around and clutching both hands on her rear, feeling the ragged edges of the seam and the large size of the hole.
"Please... settle down..." Clara gasped, face burning red with embarrassment, "it isn't that funny..."
The class clearly disagreed, continuing to howl with laughter at the attractive teacher's humiliating predicament. Some of them began chanting 'Ozzie Ozzie Ozzie! Split her pants!'
"Stop that!" Clara exclaimed, stamping her foot in frustration and then her eyes opened wide in shock as buttons burst from her blouse, her pale belly pushing through the fabric. "No!"
The laughter doubled as Clara let go of her rear and tried to pull her blouse back together, more buttons popping off as she wriggled, the garment opened up to her white bra which only just contained her breasts. She also unthinkingly spun halfway around to hide her front, bringing the split in her trousers back into view of the class.
Clara took hold of the open front of her blouse and tried to pull it together, but it would not reach. Taking a deep breath, she gave one final tug and immediately regretted it as the blouse split up the back, the cotton tearing with a loud noise.
She began to turn on the spot, trying to grab at the large tear in her blouse, or at least find the size of it, making three full turns before the fastenings on her trousers burst open and they dropped to her ankles, tangled up and tripped her so she landed sprawled on the floor, backside sticking up in the air.
Clara clambered to her feet, holding on to the ragged ruin of her blouse but leaving her trousers around her ankles as she shuffled awkwardly into the corridor, humiliated and desperate to escape from everyone watching, laughing at her, taking photos.
"No phones in the classroom!" Clara squeaked at the students filming and photographing her, but she could not be heard over the laughter.
She staggered into the corridor, where she found doors opening and more people coming out to see what the fuss was, she felt like her head was about to catch on fire from the heat of her blushing.
Clara's ears pricked up as she heard a familiar whoosing sound from around the corner, she shuffled towards it, knowing the TARDIS would be there to take her away from this horrendous situation.
"The next planet we go to had better have a gym..." Clara grumbled.

Excellent

Never watched Doctor Who...though that was a good story...ever thought of doing another X-Files story with Scully and Reyes?