>>42702956
The clothing obstructs the natural flow of snowpity radiating from the mare's body and concentrates it, leading to a buildup of ambient tension which your body reacts to. The instinctual response to this is to try and remove the clothing, restoring the natural flow in a release that is pleasant and exciting for both you and the mare.
However Anonmare would likely get annoyed if you tried, as she's trying to present herself as respectable and mature. Those clothes aren't for fun, they're for serious business!