I have a similar story; except in my case I was fired because my shirt was insufficiently black.
Could you elaborate? Were you fired for once not having a black shirt, or for not being able to acquire / evaluate black shirts? or, if it's possible to tell, having a bad attitude about the shirt rule?
I had a shirt I felt was black & meet the dress code; the manager felt that it didn't. I felt that since I had already spent something like 60$ on new clothes to meet the dress code, and since I didn't interact with the customers at all, I wasn't going to go and buy a new black shirt. The manager felt I no longer needed to work there.
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