A well fitting suit is key to wearing a suit (or any work clothes) . The hunt to find a perfect fit may take time, but once found it will be worth it. If you are tall or petite, look for a place that specializes in those sizes. I am petite and found everything at Ann Taylor fits me to a T. Whenever I want to add to my wardrobe I know I can order from AT and not worry about fit.
Here are some photo inspiration for mixing pieces:
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