Folks have presented the proper case for proper fit for 2 people.
Tandems are like shoes . . . the right size matters! So wear sandals as fit is not as crucial . . .
Yes, you can have a make-do fit in a tandem also.
We've owned 4 custom tandems; pilot 5'7", stoker 4' 10 3/4".

Pedal on TWOgether!
Rudy and Kay/zonatandem