Animorphs T Shirts produced in 1998/1999 were made by (at least) Giant Merchandising in the US, and Blue Whale in Australia.
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'I Have the Sky' shirt showing Tobias morphing hawk from the cover of The Encounter.
Thumbprint shirt front. This shirt is made in Australia by Blue Whale.
Graphic closeup
The Invasion Has Begun shirt
White shirt showing the morphs of multiple covers. This shirt was won in a contest.
Graphic closeup
Shirt showing half tiger/half human eyes and the word 'Animorphs' below the graphic. This shirt was for sure made by Giant Merchandising.
Graphic closeup
Human/tiger eye shirt back
Human/tiger eye shirt tag, showing Giant Merchandising logo
Blue Shirt showing circles labelled with the name of each character, with a picture of the eye of the character's favorite morph (or battle morph) inside each circle.
Graphic closeup
'Make the Change' shirt front
Graphic closeup
'Make the Change' shirt back
Jake/Fly The Capture shirt made by Giant Merchandising.