Even though some "purest" say that fur sporrans can go with everything, and others contend that fur is for hunting only, modern usage normally reserves fur for more dressy times.

Go with something casual. - I would wear a belt.... only because I think it completes the kilt.

Of course back in my pant days, I always wore a belt with everything also. Maybe it's a security thing with me.

Stay warm, have fun, go proud!