The Tiger Models very fine chain is good for 1:350 scale cruisers & smaller. Tiger also makes a fine chain which is good for 1:350 scale BB & CV.
Tiger Models stuff is available through the armor model aftermarket sources.
Your other alternative is model railroad chain. Campbell makes some 45 LPI stuff shich is sized similarly to the Tiger fine chain (i.e. good for larger subjects).
Some may suggest that you get some cheap costume jewelry chain. IMO, using it on a ship model, it looks like cheap costume jewelry.