Everyone knows these are Imperial Scout Service uniforms:
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I could have sworn those were MoJ agents on an anti-smuggling task force

There is an alternate model for Imperial Navy Uniforms. I don't think this applies to the OTU but it might be useful "Age of Sail" based ATUs.
Officers provide their uniforms by private purchase. Uniforms are tailored according to an approved pattern but can vary greatly based on the Soc of the wearer.
Other ranks are provided with a dress uniform by the ship's captain and the pattern, colors and style are based on his/her personal preference. Working dress in purchased from ships stores and is bought or manufactured by the navy in bulk. Crew members with any skill in tailoring become very popular under this model.
Vacc Suits are provided in the same manner. Since they must be tailored to the wearer Officers provide their own by private purchase while other ranks have to make do with a limited range of sizes and must use bungie cords, padding and putty to make them fit safely.
Not for the OTU Navy perhaps but it might be the model followed by Pirates and other organizations.