i dont know im try to come here for answers
The only way is to make your mii a favorite, which turns the mii's pants red. You cannot choose the color you want the mii's pants to be. You can only have 10 favorites.
I'm pretty sure all Miis have navy blue pants. Unless you mark them "favorite" which makes their pants red/ The way you see Miis with blue pants is because if you go on Mii Contest Channel, and you go on posting plaza, you see other people's Miis, and because they are other people's Miis they have blue pants. (You can't edit Miis with blue pants)
get long white hair, make brows thick and white and raise till they look like ears then raise them over the head till it looks like inuyasha and give him red shirt, favorite pants,serious mouth, and anime eyes.
Miis with blue pants are miis that do not belong to you. You get these miis from the CHECK MII OUT CHANNEL which you can only get if you have WI-FI!
to get a golden mii you have to svan a qr code or get them through streetpass
if your talking about on the wii and not the 3ds you have to put it on favorites when you are picking out the name and shirt color
It puts a crown next to/by their name(I think) And makes their pants brown/dark red.
You need to have a White-clothed Mii use 'Magic' to illuminate the area.
u have to write in the computer special mii in a search engine and click images and then hover over a barcode image to see if it is a celeb/special mii and if it is go on the mii make menu and click on scan/make barcode and click scan barcode and scan it and u will get a celeb/special mii
Mii(second)
To make pants half white you can easily bleach the side of the pants you wish to be white.
look on www.nick.com