Honestly - is this even possible?

I am a very long legged rider on a typical narrow bodied TB. No matter how much no stirrup work I do, or what length I make my stirrups, I cannot keep my lower leg on when jumping or cantering in 2 point. It feels secure and is functional for the most part, but when I look at video, it just looks really loose to me. I ride in a close contact forward flap saddle. I have another saddle that I use for trail riding. It is much bulkier than my jumping saddle, and I have absolutely no problem keeping things tight. It got me to wondering. Is there a point where, out of sheer physics, it is impossible to stay tight in the tack on a narrow horse, or am I just still massively out of shape?

I have the same problem. My horse is small and very narrow. I have to keep my knee off in the jumping saddle to have the lower leg support. It is frustrating me in dressage too now and it's hard to have full leg contact.

Oh yey. I thought I was the only one. My knee comes completely off too. It drives me nuts, but it's the only way I can keep my lower legs on.

My friend has a very narrow horse as well... She can do no stirrups all day long with no struggle but cannot for the life of her keep her legs still over fences!
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Well there isn't really any horse to "fill up" your leg so there's nothing to grab onto.