I returned to work a few months ago and (bearing in mind it was spring at the time) this is what I introduced:
- Hobbs navy knee length skirt (21in Fontana, still on website but can't link as it only pops up in a pop up..?!) - Jigsaw cream patterned tie neck blouse - Hobbs longish lightweight wool skirt (bias cut) - black high heeled mary jane shoes with 'ties' on the front - white shirt from M&S (plain & v basic - pink LK Bennett jacket - Boden navy/green skirt - Boden navy blazer
Having written it down it sounds quite a bizarre combination, but the items matched pretty well with other things I had (I have a lot of blue).
Depends on your budget really. I think Jigsaw does well cut, classy seperates - but it's not particularly cheap.
I got a great, flattering linen mix suit from M and S last year that I am getting lots of wear out of this summer - that was about £50.
For teaching, I would have though you might one suit for any times when you felt you may need to look extra smart.
I would get 3 or 4 more expensive things from places like Jigsaw/Banana Republic/Whistles, and then supplement with tops/cardigans from whereever you usually shop. I have a variety of things from Top Shop/Zara/Monsoon and Asda!