Why not? If it makes you happy and you can afford it, what's the harm?
[Granted, he'd understand the sentiment, feeling more or less the same - he's a soldier, a warrior, someone who gets dirty and grimy and all messed up; he wasn't meant to be adorned with anything. Purple, if nothing else, isn't a melee fighter (at least not to Hijikata's understanding) and would hopefully remain unruffled at a distance from the enemy!]
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[Granted, he'd understand the sentiment, feeling more or less the same - he's a soldier, a warrior, someone who gets dirty and grimy and all messed up; he wasn't meant to be adorned with anything. Purple, if nothing else, isn't a melee fighter (at least not to Hijikata's understanding) and would hopefully remain unruffled at a distance from the enemy!]