There are times I wish some of these all-in-ones could be split and their individual parts made available. The Mariner's Hauberk is one of those moments. It's because the shoulder wrap is really unusual, even taking into account how many cosmetics there are in LOTRO now. While its shape is unremarkable, it features a really elegant wing motif along the collarbones.
I guess sailing is like flying, but on the ocean?
Anyway, the only really odd thing about this hauberk is that the stripes you can see on either side of Glinmaethor here are actually straps. You can see these on the Wiki, where you will also find this cosmetic on a male character.