I think they should have a variety of uniforms they wear, with variations on the Fantastic
Four's classic design. Short sleeves on some, long sleeves, fingerless gloves on some,
variations for space, under water, relaxing, in battle, etc.
Here Sue is wearing an FF jacket. More casual.
FF space suits
Fantastic Four uniforms for the cold
Fantastic Four under water suits
Fantastic Four space suits
Here Sue is wearing a Fantastic Four uniform that isn't so tight fitting. Maybe they can
wear baggy stuff sometimes.
Like in this one of the Thing, he is just wearing a Fantastic Four shirt,
blue with the 4 symbol.
This one too. But Imagine this in blue, instead of white
and imagine its maybe their main action uniform but not their only: