Hi, I wear the hood jeans on my Spanish trips and have walked around in them as well, not ideal perhaps, but safety is paramount.
Just pack another pair of lightweight removable leg trousers for when off the bike.
If I'm ever on the bike withoiut full armour I feel naked, I've had the odd bad accident to know what would've happened without it.
Thanks for the link BTW to roadskin, their hoodie looks ideal for summer trips over a heavy jacket.