  Polarization measurements provide strong constraints on models for emission
from rotation-powered pulsars. We present multiwavelength polarization
predictions showing that measurements over a range of frequencies can be
particularly important for constraining the emission location, radiation
mechanisms and system geometry. The results assume a generic model for emission
from the outer magnetosphere and current sheet in which optical to hard X-ray
emission is produced by synchrotron radiation from electron-positron pairs and
gamma-ray emission is produced by curvature radiation or synchrotron radiation
from accelerating primary electrons. The magnetic field structure of a
force-free magnetosphere is assumed and the phase-resolved and phase-averaged
polarization is calculated in the frame of an inertial observer. We find that
large position angle swings and deep depolarization dips occur during the light
curve peaks in all energy bands. For synchrotron emission, the polarization
characteristics are strongly dependent on photon emission radius with larger,
nearly $180^\circ$, position angle swings for emission outside the light
cylinder as the line-of-sight crosses the current sheet. The phase-averaged
polarization degree for synchrotron radiation is less that 10% and around 20%
for emission starting inside and outside the light cylinder respectively, while
the polarization degree for curvature radiation is much larger, up to 40% -
60%. Observing a sharp increase in polarization degree and a change in position
angle at the transition between X-ray and gamma-ray spectral components would
indicate that curvature radiation is the gamma-ray emission mechanism.
