I think that 7 everyday outfits plus a dress up outfit is plenty, like someone else said.
If you're looking to simplify when buying new clothes, try to stick to a particular palette, so that it is all interchangable. Buy bottoms in colors that will match a lot- denim, khaki, navy, etc. That way, any shirt will match it.
I find that one load of laundry a day (washing, dryng, folding and putting away) is more managable for me than several at once.