Castelli sizing compared to the PH jersey?

[Jorrocks]

Can anyone give an idea what the 'real world' Castelli equivalent would be of the new PH jersey in Procut 7?
Many thanks!
J.

[shogun001]

Size 6 is a castelli large on the jerseys for me. Arms are quite a bit longer than the castelli but chest/waist is about the same.

[Jorrocks]

Hmm... I'd better try an XL to start with then. Thanks!