Generally, many clothing factories or online sell tags and marks (trademarks). You can replace them after you buy them yourself.
It is difficult to change the mark (i.e. trademark). It is too troublesome to change it yourself. You can find some small processing factories to help. General clothes are easier to change, but those with lining are more troublesome;
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If it is a hangtag, it is relatively simple to replace it. Just cut off the original hangtag and hang a new one.