Congratulations to you and your bride! I am also glad to hear the she is leaving it to yo to outfit yourself and your groomsmen. This bodes well for both the wedding but also your married life. I concur with Troglodyte in that you should dress in the formality of your beautiful bride and her brides maids. If she is wearing a gown, then dandy yourself up. If she is wearing a simpler dress, then dress accordingly in tweed day wear and and a daywear leather sporran.
Back to your original question, I’d go with a silver/chrome cantle fur . 
Here is my sideways version of my badger sporran.
Cheers!
"Good judgement comes from experience, and experience
well, that comes from poor judgement."
A. A. Milne
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