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Looks like Stealthic Aquaria to me, though I can't find a male version of that. But you can enable hair for both genders through Master Controller, and that will make hairs load even longer. So I hope a male version exists too .
Or, alternatively, you can tick some flags in S3PE and enable it for whatever gender and outfit category you want. Which is a plus if you only want to enable one hair, not all of them