Go to a thrift store... generally speaking they have good clothes (as they throw out or simply refuse to accept any bad quality donations). You can also potentially purchase longer pants to cut them off and ask someone to hem them (if you know anyone who can... and you may want to ask around before assuming that you don't).
wear anything, everything is fashion if you passionate about it and you are comfortable it.
Ross,marshalls or maybie even walmart, or a playtos closet(used) :)