I think that a hair sporran looks nice with a very formal traditional outfit. Check out the recent thread of pictures of clan chiefs to see the wide variety of hair sporrans (and other types) out there. I have an angora hair sporran (a bit smaller than a typical military hair sporran) that I really like.

That being said, the market is flooded with hair sporrans typically used for pipe bands which all look the same (same chrome cantle, white hair with two black tassles) which adds to the "hair sporran = piper" phenomenon.

My advice:

If you plan to wear formal kilt attire in a traditional way (clan tartan kilt with Regulation/Sherriffmuir doublet, argyll hose, etc.), I think a hair sporran goes well. See Matt Newsome's website for some of his pics of formal wear with a hair sporran.

If your attire will be more contemporary (solid black kilt, black military-style "Service Uniform" jacket) or more day-wear (it's a day wedding, right?), then I think the hair sporran would look out of place, unless you really play up the Edwardian/ "John Brown" look (which may look gimmicky).

If you could post pics of the other elements of your outfit it would be a bit easier to conceptualize. Otherwise, I'd vote for a more understated look, without the hair sporran.

For what it's worth (from a guy who is thrilled to be married 9 years and counting), try not to get too hung up on the clothes you'll wear at the wedding. I've found that the everyday joy of married life makes the "pagentry" of most weddings seem a little misguided. Best wishes, buddy, on this wonderful new adventure.

Cordially,

David