I apologize if the answer is vague but you can create clothes, accessories, or any other extra things by using googlesketchup and downloading a pulgin for it to be used as a .x file in MMD.
If you are using the MMD multi model edition they should be in your MMD[insert version of MMD you are using] → UserFile → Model
you can get more models from searching on youtube.com mikumikudance models download link and my custom mmd models ect.
Fashion designers often are the ones that make super models' clothes.
Deviant Art
SureinDragon makes the models that Valforwings converts have bones so that they're like models and you can move them.
If you are using the regular MMD (miku miku dance) you cant but if you are using a multi model edition of MMD you can download new models.
Miku MIku Dance (MMD) is a 3D animating programm., witch is used to make models dance, pictures or even to make short movies.
ANSWER TO YOUR QUESTIONMy MMD wont load Models and now it wont even open up MMD it seems like nothins working and I downloaded the lastest MMD whats going on?-Edit-I think it might just be the program itself. My MMD wont open up, and I downloaded it again. If it IS the program itself, watch out. Your MMD files will start to delete themselves.I had this happen to me. The best thing would be to secure your computer. Find out if it is a virus. Then scan your computer for a birus, and scan it for Cookies, also.If It is a virus, clean your browser, delete your browser cookies, and clean your computer.Reboot it and download MMD again.
PMD Editor is an application for MMD (Miku Miku Dance) where you can edit the models
if you go on google you can search for the mmd models which u will use and the motions (dances) they will do. I suggest going on deviantart.com for those. Then go on youtube and lookup tutorials on mmd.
.mqo is for metasequioa, Metasequioa is a program that can be use to create MMD models.
It is: MMD = 2500