2009 Vintage Halo 3 Master Chief Muscle Costume Youth Small Padded 3D + Mask.
My son used this one year for Halloween back in 2009.
A couple of pulls on the left arm.
Helmet air line on eye area.
See pictures for details.
It’s a good size for Small. It measures 63” long x 18” wide.
Please let me know if you have any questions.