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This is the time when your feet are largest due to swelling from physical exertion and heat during the day. This will allow you you to check that there is adequate space (3/8" to 1/2") for your longest toe at the end of each shoe. It will also quickly indicate whether or not the fit is comfortable. Make sure the ball of your foot fits comfortably into the widest part (ball pocket) of the shoe. Your heel should fit comfortably in the shoe with minimum amount of slippage. If your feet are wider or narrower than average, some shoe ranges will help you to get the perfect fit with either a wider or narrower shoe fit. This may cost a little more but the comfort will make a little extra cost worthwhile. Not all stores carry these, but when they do, you may find that you're happier in between whole numbers. Fashionable shoes can be comfortable and healthy, you just need to find the right pair that includes comfort features. Different styles of dress shoes will have different comfort levels, so by trying a variety of different shoes will give you a good idea of which ones are more comfortable within the range.
Try on dress shoes at the end of the day. Stand during the fitting. Assess how the base of your heel fits the shoe. Check the positioning of your heel. Ask about different widths for the dress shoe. Ask about half sizes if you think your feet are in between the standard full sizes. Walk in the shoe to make sure it fits and feels right. Try different shoes.