Hi, good luck for PGCE! Hope it all goes well.
I used to wear (before I got pregnant!):
Employed as classroom teacher: long linen skirts, below knee skirts, black trousers from supermarket or primark. Tops from here, there and everywhere but always checked to see if you could see anything when bent over. I never wear blouses without a vest underneath. Flat shoes!
Employed in more managerial role: wrap dresses from h&m, separates from coast, m&s, shift dresses from m&s and primark. Flat shoes if I'm teaching lots, heels if I'm in meetings & can sit down all day :)
I own 1 suit that I hate wearing with a passion as I feel I'm on interview. I tend to buy cheap shoes & replace often. I used to rip all my clothes at the hip as they'd catch on benches so I wouldn't wear anything too expensive until you know what your classrooms will be like.
If your school(s) are dead smart maybe have a suit jacket you wear in the corridors etc but that you can take off in the classroom.
Hope you don't end up in a school like the one near me where the female staff were encouraged to wear neck scarves, full make up & high heels to match the head! :)