I have a check, clearance is pretty tight, unfortunately the fork doesn’t tapered outward enough to provide more clearance, do t think a 38mm will fit.
Here’s the clearance, with the tyres (measures nearly 30mm, not pictured), it’s a tight squeeze to fit mudguard on, you can see how the fork remain the same width the further you go down.
Have to says it’s a cracking bike, but more of a road endurance geometry than a gravel geometry.
I have a check, clearance is pretty tight, unfortunately the fork doesn’t tapered outward enough to provide more clearance, do t think a 38mm will fit.