Light grey works perfectly with most shades of blue and this pattern combination works well. As long as you have 1 strong pattern (vest) and 1 “light” pattern (suit) you should be fine. Combine 2 strong patterns (like
Essential infographic guide from Samuel Windsor to ensure you make the right decisions. If you're not sure whether you want a full break or half break, or whether you should choose a flaps or welts for your pockets, this guide will help.