I somehow think, that this jeans of Huckleberry Fox (on the right) could be overalls. Brief scene at 1h23. At least I haven’t noticed any other scenes.
But why hidden under a T-shirt ? He often wore bibs elsewhere.
Main entry (other, very young boy, 2 pairs, rating 2)
Much more of interest is the 10 yo boy on the left, Troy Bishop (unfortunately not in bibs). Shirtless scenes of both. Shiny shorts blog rating 7-(8), Bishop only, Fox in speedos. But Huckleberry Fox is too young anyway.