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Mac, looking classy in your Balmorals!
Folks commonly have one foot slightly larger than the other. Determine what type/thickness of sock you will wear. Try on various shoes from different lasts to see what works best for you. There are a couple of ways to address the issues. Fitting for the larger foot. Space can be taken up for the smaller foot with various methods. Start with a tongue pad to take up some volume. Its better to address the volume issue from the top to avoid upsetting your natural balance with a single insole. If it is more of a tightness in width issue, say a bunion, buy the size which fits best and then take the shoes to a REAL cobbler and have the tight shoe stretched in the specific spot where it is tight. Stretching for length is not as successful but some adjustments can be made. You can do this at home if you want, there are plenty of online articles just a search away. Now, if your foot measures 1/2 to full size larger or more, try working with a true representative shoe shop (vs a retailer who caries various brands), they may be able to order a pair with differing sizes. Another alternative is going with a custom maker. Russell Boots and a few others make shoes and boots to fit each specific foot and can handle most any abnormality. Most folk's issues can be addressed with the above methods, though. Hope this helps.