The average StarFleet Officer should have different Uniforms for different purposes IMO, but almost all should be of similar stylings to each other unless there is a deeply thought out purpose to the different designs.Why not consider that the two uniforms exist simultaneously and have different purposes rather than one simply replacing the other?
· Normal Uniform <- Basic day to day wear within StarFleet facilities / vessels / Official StarFleet work/business.
· Formal Uniform <- Formal / Ceremonial occaisions.
· Desert Uniform <- Designed for Hot & Arid environments
· Jungle Uniform <- Designed for Hot & Humid environments
· Winter Uniform <- Designed for Cold & Wet environments
· Zero-G Uniform <- Innerware designed to work with standard Zero-G Outter ware
· Worker Uniform <- One-Piece OverAll designed to get down & dirty OR whatever specialized Uniform deemed fit
for the Service/Division/Section as needed by the job/profession
· Combat Uniform <- Uses appropriate Camoflage for the environment, ergo many types, Service/Division/Section
markings are minimized or outright hidden for camouflage purposes