Hi Russ,
This is from one source (Rule Britannia by Peter Padfield) I'm afraid and will need confirmation.
Officers - Sea Duty - Dark blue double breasted jackets without tails, similar to modern jackets but a bit more box like. No epaulettes. Black cravat or tie over white wing-collar shirt. Black boots and dark blue trousers. Black cloth peaked cap with gilt band, crown and anchor badge and the top is a lot smaller than current.
WO's - Sea Duty - Single breasted with ties - definitely not cravats. Caps were often more box like and less rigid. Closer to 'Engine Driver' type.
Other Ranks - Working Rig - Was apparently self made (It seems that standard uniforms were only issued after 1907) although there was a basic pattern. Colour was either blue serge or white cotton duck and it was similar to current although, again, the blouse was squarer and appears shorter. The scaff was also slightly shorter but the lanyard was there. The hat was a smaller, softer version of current, either all all blue or white/blue.
Often still bare feet.
Hope this is useful.
Tony