You never want to get into a fight with your clone(s) about who came first. Unfortunately, an individual clothing or marking of some kind can be easily replicated, so consider marking the clones, perhaps by numbering them, or even just drawing a prime symbol - ‘ - on their foreheads.
In the anime Urusei Yatsura, the clones of Ataru actually all head apostrophes floating above their heads, which was super useful, but hard to replicate. At any rate, if you don't immediately establish who came first, there is going to be a fight, and the winner becomes the original by default.
Special Bonus Tip: Don't differentiate your clones by adding extra "u's" in your their names, like "Luuke Skywalker." It makes them and you sound like an idiot.
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