I have one of those also.  They are exact copies of the original, even to size.  The Brits of 1898 were small people. The bandolier I have nicely fits my 11-year old grandson.  But it won't fit an ordinary American adult who weights over 150 lbs.

The belt from S&S is not made by or specially for S&S.  There is a small firm that makes Mills belts and sells them.  I can't find them right now, but they have a web site & sell directly.  The belt I bought from S&S is adjustable from about 32" to 50".