While this exact Whistles top sold out, you can achieve the same styling trick with their Ally side-belt top (if you prefer an interesting waist detail) or Anna poplin shirt (if you want a long layering piece). It's just different enough to break out of the work-clothes rut without interfering with unspoken workplace dress codes. Then, to finish it off, keep the rest of your accessories classic.
In case you were wondering if those culottes you bought last season were still relevant, the answer is yes. They're the perfect piece to wear during these temperamental months, when you can go from shivering to sweating in your thin T-shirt. If you're looking to make a big splurge, this leather-and-metal pair by Tibi is a definite indulgence. The cool suspended effect at the hem is probably unlike that of any other piece in your closet.