Does anyone have any tips?
Historically, as I have short legs (and short other bits), I have always struggled to maintain the traditional classic seat. My body composition tends to push me into more of a chair seat, prevents me opening my hips, and thus turns my toes out, preventing me from using my legs as effectively as I would like.
I have always ridden ponies or horses under 16h that are narrower as I find with less horse I can wrap what little legs I do have, round them easier. Also a 15 inch saddle has less leather to get in the way of my wee legs

Now I have a problem, a big one. Actually a 16h3, shire cross, rising 4 sized problem...
I am currently riding my friend/instructor's newly broken mare and struggling rather a lot. I'm fine with hacking - we've done quite a bit of that (including in the snow) and she will do transitions in the school by voice (6 months of long lining paid off) but I just don't feel like I am riding her in a manner that will help her.
Exercises I do already are taking my feet out of the stirrups and lifting my legs out sideways to open my hip. I also try and pull the back of my thigh to bring my leg round into a more correct position.
It really doesn't help with the horse having an 18 inch saddle

it means much of my leg is in contact with leather rather than the horse - think 3 year old on their first pony type look

So does anyone have any tips? Changing the saddle isn't an option as the horse isn't mine...
Here's a rather pants pic of me riding my old loan horse - he's the biggest I have felt comfortable on at 15h1
Edit - can't find any flat pics so here's a jumping one for now...

Off to find a flat photo...
Edit 2 - as this is a 3 (nearly 4) yo that has only been broken for 8 weeks please don't suggest stirrupless riding - I value my life
