LDS people only!!!!!!!!!!?

i am going to a pioneer trek for the first time and its on Wednesday and i only have 3 in a half days to find a pioneer dress, the problem is were can i buy it? can i wear any kind of pioneer dress??? im kinda nervous becouse there will be alot of people and my other church memebers from my old branch. i have made my pioneer dress but its fugggly!!!!! also people helped me get my dress done but they didnt make my dress right. its saggy and its all rainbow looking... >:( i dont feel like going to trek becouse of that. i want to have a good time, not murmuring or whatever and having a attitude . .. any help. i live in auburn wa. and have no idea were to buy them. i looked on the enternet but nothing... help pleaseee???