They are certainly sale-able and collected. The value of your uniform depends on which type you have and the number of garment pieces - below are examples for scope of auction sale value on the recent market.
Here is a link to winter wool top and paints that sold at auction a few weeks ago for $50:
and another with prior owner attribution that sold for $65 last month too:
Here is a Navy Lieutenant Commander Uniform Coat & Cap that sold a couple weeks ago for $52.55:
Here is a 12-piece Naval Officer's uniform set that sold about 6 weeks ago for $125:
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