what's that?

I came across this photograph on finelittleday and liked it immediately: this costume could be anything from an alien to a bug to a space suit, which leaves it open to every child's imagination.

I wanted to know what kids aged 5 years would think, so I showed them the pict and simply asked them: what's that?
The kids were, as expected, very inventive in their response but one in particular was a genuine surprise (and laugh).

Jacob said:
"I know it's me, but I am not sure if I remember that suit - what suit is that???".