For suits, sportcoats/blazers, and trousers my policy is go in person to buy it.
Is it okay if I order some or one dress shirt and ties online?
Please clarify your question. Are you asking whether purchasing these items online is morally permissible? Are you asking whether it is possible within the boundaries of physical space-time? Or, perhaps, whether such a purchase would meet with the approval of social peers, if not superiors? Would Socratic or Platonic ethics permit such an action, even though Aristotelian ethics would not?