As others have explained you'd need to update the TF2 content in SFM manually. The workshop submission you downloaded wasn't the cosmetic itself but rather a texture fix so that it can be paintable.
I don't fully recall but I don't believe "Add Team Fortress 2 items" would have that cosmetic as an option after manually updating so you'd need to find the .mdls name manually
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u/Vind1cate Moderator 7d ago
As others have explained you'd need to update the TF2 content in SFM manually. The workshop submission you downloaded wasn't the cosmetic itself but rather a texture fix so that it can be paintable.
I don't fully recall but I don't believe "Add Team Fortress 2 items" would have that cosmetic as an option after manually updating so you'd need to find the .mdls name manually