If you were able to unlock it, but didn't have time to claim it (or any other season pass items), you can claim it here: https://www.bungie.net/7/en/Seasons/PreviousSeason.
If you did not actually unlock it, however, you are now unable to do so.
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No, I just didn't have enough time to play and reach seasonal level for final piece of armor.
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All gone, then. I'd recommend using exotic helmets with that set to make up for it lol
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sometimes life has to take priority. sorry. i'm sure at some point it will be available in eververse....