Until recently I would write Principles off without a thought, it was a more mature lady's shop as far as I was concerned. So either I have got to that 'more mature lady' bracket or I was wrong.
Principles offers a good range of smart/casual wear and yes some of it is a on the mature side but diversity is the key and younger or older we must not be afraid to check out stores we may not be so familiar with. You could be surprised.

An instant outfit for under £115