An analysis of the conformation of a ribbon-type polymer in dilute solution is given. By combination of small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) the effect of the finite dimensions of the repeating units can be assessed separately. It is thus possible to evaluate the experimental data to yield the form factor of the corresponding infinitely thin chain. This form factor could be evaluated for three samples differing in molecular weight and compared to the theoretical expression furnished by Kholodenko (Macromolecules 1993, 26, 4179). Good agreement for all molecular weights under consideration here could be achieved. The analysis shows that the ribbon-type polymers under consideration here are wormlike chains with a persistence length of 6.5 nm.