You have to understand that the leading politicians in the coalition are not very sophisticated. The Guardian takes them to task:
Memo to the coalition front bench: JLS called, and they want their colour-coded look back.What? Me? Since I retired, I don't wear ties, except at funerals (black) and weddings (light grey). And no, I've no idea who JLS might be ...
From their early days on The X Factor, the boyband developed a formula whereby each member wore a similar outfit in different colours. This worked brilliantly on a TV talent show, lending them coherence and individuality. But is it too much to expect a little more sophistication at the House of Commons than one does when watching a Saturday night talent show? Apparently so.
The quartet of block-coloured ties modelled by Osborne, Cameron, Alexander and Clegg for the autumn statement was an eyesore. Cobalt blue, purple, pink and blush: frankly, the Muppets use a more nuanced palette.