There is a time and place for everything. There is a time to air grievances and to express disagreements. The middle of a sacrament meeting is not one of them. Sunday is a time of worship, a time to remember and express gratitude for the sacrifice of the Savior. It is not a time to single out a group, or segregate yourself by 'taking a stand'. And it is has really bothered me that people who are proponents of this day are saying things like they are fighting the culture, or this is a way to identify others who have the same ideas or it's not political.
1) Fighting the culture of the LDS church is like fighting all of Western culture. It's useless and pointless. You shouldn't wear pants to church because you want to fight against a culture. You should wear pants because that is the best thing you wear. The idea of 'Sunday Best' will always be a suite for men and a nice dress for women. If you don't have that, wear the next best thing. I don't feel like the Mormon culture is perfect, far from it. But making a political stand against wearing dresses is just silly.
2) Wearing pants to church to help identify others who are like minded so you can band together creates separatism and a us vs. them mentality. You never want to create a group that is separate from the whole. Once that happens, everyone around you, including yourself, segregate this group.
3) There is no way this isn't political. The feminist movement is a political movement, there is no way to separate them. If you are pushing feminism into a religion, it is political.
At then end of the day, what we wear to church isn't the matter here. It is a group of people fighting against something that has nothing to do with the doctrine or teaching of the LDS faith. Pushing a protest, a worldwide protest, in the middle of a worship service where covenants are recommitted is inappropriate and a slap in the face of the Lord.