I love fashion and have docs, vintage pieces, and animal print in my closet currently. The pieces that make it into my work wardrobe are the animal prints (banana republic and Ann Taylor have some nice work-appropriate versions) although depending on the style of the doc (they have some chic dressier styles) I could conceivably see myself wearing them to work someday. I enjoy finding a way to make fun pieces work in my work wardrobe and the key is to limit yourself on how many "out there" pieces you incorporate into a look. I think there is a way to incorporate personal style into business casual in a way that would not be too eyebrow raising to patients.
I have seen some of the most interesting outfits in psych outpatient because you aren't as limited by needing to be able to run around a hospital/do a head to toe physical exam. I have also seen one adolescent inpatient psych attending wear skater dresses with fun flats every day. Peds is where I have seen the most out there styles - purple hair, holographic fanny packs, superhero shirts. I think you should wear what you want within reason, it's going to resonate with some people and put others off no matter what. For those implying that business formal is always best, here's an Atlantic article that bothered me when it was published. It's about the writer (also an MD) being disquieted that their female doctor wore a tailored suit and heels and much preferring the look of a male hospice doc in corduroys.
The Clothes Make the Doctor
Some work-appropriate doc marten examples (some with a few modifications like the pants in the last one should probably be a bit less close fitting):
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