THE HIT-OR-MISS: Waist up, we love Allison Williams in this Giambattista Valli gown. The colour is glorious and somehow doesn't make her look like part of the carpet, and the contrasting beading and brooch add a real vintage air. Waist down, however, the frothy tent of tulle does swamp her figure in a sort of human Weeble way. However it does look better from the back ... if the section from the waist to the netting had been a tad more fitted, flaring into a dramatic fishtail, we'd call this…
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