I don't have a good answer for you.
West Virginia law has only distinguished between OC and CC since 1989. As for the definition of "concealed," W.Va. Code § 61-7-2(10) provides that:
However, there is no case law interpreting the definition of "concealed" under West Virginia law. I definitely would not try IWB carry if you do not have a concealed carry license that my state honors."Concealed" means hidden from ordinary observation so as to prevent disclosure or recognition. A deadly weapon is concealed when it is carried on or about the person in such a manner that another person in the ordinary course of events would not be placed on notice that the deadly weapon was being carried.
You also face some impediments due to various firearm regulations contained in W.Va. Code § 20-2-5 and which are discussed in some other threads here in the West Virginia section.
I am going to speculate that you are only going through our Eastern Panhandle. If that is the case, I definitely recommend that you just unload & lock up before crossing into Maryland from Pennsylvania and then not reload until you get to Virginia. On I-81, that's only around a half hour to go through both MD & WV.
Since you seem to travel a bit, I would also recommend getting a Florida CCW, which would greatly expand the number of states where you can carry. Florida should accept the same proof of training you used in CT.