I (not trying to be cocky, lol) have a lot of attractive clothing in my closet, and I don't really have a specific method I use, usually just casual jeans and a dressy shirt, or a dress[sometimes], maybe even a skirt with a tank top. If you want to have a specific method, you could do dedicated weeks for one type of outfit. Like a dressy week, a causal week, a professional week, an impress-your-crush week, lol, etc. It's pretty easy. I do that during the summer...it's kinda stupid, but it is fun!
I have this same problem!! I spend 2 hours in the morning fixing what I am wearing and changing outfits. You could look at the weather for all of the days and at least plan out what pants you are probably going to wear. Then pick a few shirt options for each day! If you are feeling sick or lazy one of the days just throw on leggings, yoga pants, or sweats and a cute shirt that matches. Think about your favorite shirts and pair them with some of your favorite jeans or pants from your favorite store...maybe like Hollister!<3 Then pick some cute shoes, put on some makeup(if you wear makeup) and go to school! Have your parents or you can do laundry often so that what you wish to wear is usually clean! Wow thats really long...So sorry! Hope it really helped:)
Plan it on Sunday after looking at the weather! :) Usually what I do is wear jeans/shorts with a cute top and and sometimes a dress or a skirt. On lazy days I wear calf high spandex pants a little below my knee and a jacket or sweatshirt that goes with my skin and hair color with tennis shoes like vanns! If you don't have time or the weather seems like it's going to change then pick the outfit the night before! Hope this helps! :)