If there's one thing I find the most difficult to find for workwear, it's tops and tunics to wear with trousers.  Most are either too casual, too tight, or too short. And when you're in a hurry in the mornings, sometimes you just need to have a selection of neutral basics to put together for a 'go to' outfit. I love this tunic from Uniqlo because the fit is flattering and the fabric thin enough to layer another top underneath. I'd wear it over a pair of tailored grey trousers, and add a lighter scarf to avoid the whole outfit becoming too dark. Or add a pop of colour with bright accessories. 
Merino Tencel Round Neck Half Sleeve Tunic £29.90, Uniqlo; 
Grey trousers £22, Next;  
Navy dip hem crew neck trimarl top £8, Dorothy Perkins; 
Dolce Grey scarf £13.99, Bellissima Scarves; 
Hematite bling rings £8.50, Dorothy Perkins; 
Hards bag £45, Aldo; 
Country Music shoe £39.99, Clarks.