Cultural discrimination or a reasonable dress-code restriction?

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Questions at bottom.

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TL;DR: A male bus driver of Scottish ancestry rented a kilt to wear to work on casual Friday, despite knowing kilts were off limits per casual Friday dress-code. He purposely challenged this dress-code restriction, claiming it was anti-Scottish discrimination and compared his kilt to “wearing a turban for religious reasons”. He was sent home to change and subsequently filed a discrimination claim.

Full Story:

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Questions:

1. Do you think banning kilts on Casual Friday is a reasonable restriction, or do you consider this discriminatory?

2. Do you think the bus driver handled the situation well? (Purposely violating the dress code to make his point)

3. Do you think cultural discrimination and religious discrimination are equally wrong? Should cultural practices/attire have the same legal protections as religious practices/attire?