SQL*Plus save current COLUMN settings
You can edit $ORACLE_HOME/sqlplus/admin/glogin.sql file and add inside your col format settings :) 

[ora11g@botor ~]$ cat /u01/app/ora11g/product/11.2.0/db_1/sqlplus/admin/glogin.sql
define _editor=vi
set lines 450
set pages 100
set time on
set timi on
set serveroutput on
......