If you need a medicine cabinet for your bathroom remodel, you can stalk your local Re-Store and in just a short while, you are sure to find one. But, old skool cabinets can be quite small, only about 16″ wide and 20″ tall. When I renovated my bathrooms, I wanted more space, so I put in new 20″wide x 26″high medicine cabinets. Square, beveled mirrors. I don’t think the medicine cabinet looks oversized or anything. Now, I’ve discovered these five cute medicine cabinets from Kohler, which all feature additional decorative oomph — arches or frames that might work nicely in vintage homes. Note, these are even taller — 31″ tall. While I think we need to be very sensitive to scale within small spaces, I don’t think the extra 5 inches will be too much. However – I’d likely flank a cabinet this tall with two sconces, not put a single fixture above. 
This is absolutely my favorite of all the Kohler designs. That loopdeedoo arch reminds me of a 1930s or 1940s triple-vanity mirror I owned once. It is very sweet, and I think it would look great in a “sweet”-styled bathroom. Here’s the listing on Amazon, these cabinets are available from a variety of sources: Kohler K-CB-CLC2030VAS Single Door 20-Inch W by 30-Inch H by 5-Inch D Aluminum Cabinet
(apparently no longer available, but I will keep photo up for historical purposes.) Disclosure: I get a spiff anytime you buy anything after clicking into Amazon from any A-links on my site.
Above, arch on top only: KOHLER K-CB-CLC2030AS Single Door 20-Inch by 30-Inch by 5-Inch Aluminum Cabinet 
(apparently no longer available, but I will keep photo up for historical purposes.)
KOHLER K-3073-NA Archer Mirrored Cabinet
Above, arches on top and bottom:
Above, gentle arches above and below and beveling all around: KOHLER K-CB-CLC2031BAN Single Door 20-Inch by 31-Inch by 5-Inch Aluminum Cabinet
Above, wood framed medicine cabinet with arch on top: KOHLER K-CB-CLW2030DAW Single Door 20-InchW x 29-1/2-InchH x 5-1/4-InchD White Enameled Aluminum Cabinet
I couldn’t find the daisy mirrors any more, but I saw this one, which seemed retro to me (but Pam or someone else can give a more official yea or nay!).
https://www.lowes.com/pd/Jensen-ToPSIder-24-in-x-19-5-in-Rectangle-Surface-Mirrored-Steel-Medicine-Cabinet/50192929
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