If they put every single clothing option from SRTT into SRIV then it would be incredibly huge.
Not to mention, metrics probably showed that people usually only wore those clothing options as whole outfits and not piecemeal.
You're doing it wrong. It's "THUNDER! THUNDER! THUNDERCATS! HOOOOOO!!!"EDIT: Also wanted to say, but had to edit since no one's replied. The new compliments/taunts are pretty sick, they brought in the requisite Matrix stuff, Jim Boone's awkward dance, even have my personal favorite, "THUNDERCATS HOOOOOOOOOOOO"
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but they seemed to imply that all of the clothes from 3 would be usable.