I am little on the large side in regards to size

and was think can anyone on here tell me what size the insode of a PA38 is compared to for example.
PA38 same size as a PA28
or
PA38 same size as a C150
the problem is i don't know anyone who has a PA38 near me to try out and see if it will be a good fit or a snug fit.
advice needed
Thanks
Craig