"I actually, oh boy, I didn’t realise quite what a hit they (underwear) were going to be," he laughed on "Live with Kelly and Ryan", appearing remotely from his home where he's on both coronavirus lockdown and babywatch with his heavily pregnant wife, British actress/model Jodie Turner-Smith.
"Who knew, that all these years what was missing from my career was parading around in my tighty-whities!"
The "Dawson's Creek" actor, 41, didn't think twice about his onset undies while he was filming, but now he remembers something odd that took place while the cast was shooting the first episode.
"I had forgotten this until... the show aired and the tighty-whities became quite a thing," he smiled. "There are two scenes (where I'm) in them on that first episode and they (producers) actually made me change out of the tighty-whities for the second one.
"I remember them nebulously being like, 'Well, you know, maybe it’s just a little bit much'. And I didn’t quite realise what they were saying until I watched it and I was, 'OK, oh yeah, that's a lot. There’s not a lot left to the imagination there.' "
But Jackson is having a good laugh about it all, while he's waiting for the health crisis to blow over and his first child to arrive.
"It’s OK, I'm in my 40s now. I enjoy getting objectified!" he added.