I think it is because the steric hindrance casued by the ester groups, which are more in cellulose triacetate

Tracksuits are made with synthetic fibers. It is manufactured with a combination of cellulose triacetate and polyester. There are also track suits that are waterproof and coated in nylon or PVC.

the first ever base was the cellulose nitrate but it flammable that contribute to the severe hospital fires during 1920's. it was then replaced by the cellulose triacetate which was not as flammable as cellulose nitrate.

in the early 1960's it base was introduced. it is more resistant to warping and is stronger than the two other bases.

A cinema is a motion-picture theater, a film is

a strip of transparent material, usually cellulose triacetate, covered with a photographic emulsion and perforated along one or both edges, intended for the recording and reproduction of images.

Both starch and cellulose are polymers of glucose. However, the individual glucose units are linked differently in the two. Humans have an enzyme which is capable of breaking the linkages used to form starch, but do not have one that can break the linkage used to form cellulose. (If you want the technical terms, cellulose uses a beta(1-4) link and starch uses both alpha(1-4) and alpha(1-6) links.)