It needs to be long enough to show up under the battle dress blouse!@TamH70 @Ravers, @alfred_the_great, @philc, @kinross_special and all others interested.
Outdoor Knitwear are having a 25% off Jubilee sale on all knitwear including Submariner's jumpers with this code which is valid to the 8th of June
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Made to MOD spec (they're one of the suppliers to the RN) they're well worth the money and unlike other manufacturer's brands don't shrink / felt up on a decent wash (well at least mine haven't yet).
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RN dark blue also looks very good too (my one is never off my back in the winter to the extent that I've worn holes in the elbows!)
Be aware though if you have long arms the XL is also quite long in the body, I'm 6' 1" and it reaches down past my crotch.
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Yes I know the colour is different but meh!