Is this T-shirt part of a LEGO set?

No, this item is apparel (a T-Shirt) and does not contain any LEGO pieces.

What year was this Gear merchandise released?

The LEGO HYPE X NINJAGO T-Shirt was released in 2021.

The specific set number for this item is 5006236-1.

Name: LEGO HYPE X LEGO NINJAGO Black Just Hype Faces T-Shirt (5006236-1)
Brand: LEGO

Gear

Gear · 2021

Theme · GearPieces · 0Set Number · 5006236-1Year · 2021

Used

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New / Sealed

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Is this T-shirt part of a LEGO set?: No, this item is apparel (a T-Shirt) and does not contain any LEGO pieces.
What year was this Gear merchandise released?: The LEGO HYPE X NINJAGO T-Shirt was released in 2021.
What is the set number for this T-Shirt?: The specific set number for this item is 5006236-1.