Clipping has always been a major issue and will likely never be permanently worked on. Shields though are always clipping no matter what style it is unless the model size is rather small, or you're playing a Humanoid Race with the posterior slider at minimum.
I main Khajiit and Argonian characters, and I prefer rather maxed posteriors, so obviously my Stamknight, the one character that actually would use a 1H&S setup has awful clipping. I even spent 1k crowns for the Appearance change token just to see if I could alter the body proportions to minimize or even cancel the clipping. Unfortunately, even with the butt as small as possible, the Tail still pokes through the shield at that point. Even though if she were say, an Imperial the shield would then look just fine on her, but as a Beast Race there's no escaping the clipping.
Unless. I had been staring at the idle animations for several minutes, watching what the Shield does, and I had an idea. Depending on the shape of the shield's model. Is it flat? Or does it curve outward toward the center? My possible fix is very simple.
Rotate. Take the item's position on the character model and rotate it so it's straight vertical. This gives styles with convex shapes a large chance to stay separated from the player model as well as possible avoiding beast Race tails as well. It may not be a fix across the board, but it may help multiple styles.
On a side note though, I noticed an oddity when mounted.
No clipping at all while on a mount. Interesting how it doesn't conflict here, but it does while standing.
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