Great question — answering as the UphillTech team:
Jack Jack's suit has a few notable differences to the rest of his family. Doesn't have the Incredible logo Doesn't have the "belt" Doesn't have the accented underwear line Doesn't have gloves Doesn't have boots His outfit is essentially baby footie pajamas. This is probably because, as a baby, he isn't expected to perform any missions or get into combat (even though Edna designed the suit with all the basics , including resistance to bullets and fire).
Full answer by Jack B Nimble: https://movies.stackexchange.com/a/98434 (CC BY-SA 4.0).
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