The tunic in this set is not actually white - check again if you're not sure. It is a very light, cool grey. The main theme of this season is depth, which can also translate as richness. A season ruled by darkness does not mean all the colours are close to black. Deep Winter has a selection of icy lights a little stronger than those found in True Winter. There is also a range of greens falling mostly into blackened teals and pine-jades.
I love the Yves Saint Laurent boots. So they're beyond the budget for most of us, but hopefully they give Deep Winters something to think about. The combination of black with ultra-dark inky-blue adds interest without losing the effect of depth.