As an antique and vintage clothing dealer, I am sometimes VERY lucky and come across old side saddle habits. Fortunately (or unfortunately if you are me!), at 5'9" and a UK size 14/16 (US 12/14), I'm often too big for the vintage ones I find so it makes it a little easier for me to part with a habit when I come across one.
One day in 2007, I came across this EXQUISITE c. 1909- 1910 habit made from heavy weight navy blue wool by Edward Erl. The jacket was the typical longer length with a nipped in waist of the era and the apron was the "step in style". The jacket had a velvet collar and was lined in silk and still had the original maker's label with the address of 21 George Street, Hanover Square, London W.
The habit was in excellent condition but the heart breaker was that although the original wearer would have been my height (the length fit me perfectly), she was one dress size smaller than me so I decided to sell this beautiful habit.
I ended up selling it on Ebay to a lady named Kate that rode side saddle and didn't hear anything from her until a few months later when I received an email and some beautiful photos from her.
She told me that her horse was named Blue and that he came from a rescue charity. When the horse rescue charity came to visit and check up on Blue, she put on a side saddle display for them to show how well he was doing. She wore the beautiful antique habit while riding Blue for the charity.
If that wasn't wonderful enough, it turns out that Kate only lives one street over from where the habit was originally made!