In terms of value for money.
I'm currently wearing a pair of grey trousers I bought in Next when I was returning to work after my Maternity Leave. They were suit trousers (I didn't bother with the jacket) and cost about €60. I wear them to work every week without fail (not all week obviously!). They're very comfortable and go with pretty much all my tops/jumpers. They'll be 10 years old this year! That works out at €6 per year
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