Costumes, do I only need 01 to dress 02 or more heroes?

Yes.

You summoned a costume PATTERN.

From that pattern you can make many COSTUMES…

Each COSTUME must be levelled independently & levels are non-transferable…

Currently the only use for duplicate costume PATTERNS (what you summoned) is as fodder for levelling a costume.

All covered off in the Costume FAQs…

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