It is claimed that British wartime airmen visiting the Kola Inlet to help to protect the Arctic convoys quickly started to wear ushankas because their own uniform hats were not warm enough, but "kept the ear flaps tied up to the crown as any Russian would, because it was considered unmanly to wear them down."  However, in the Russian military up to this day, the way of wearing the ushanka — up flaps, down flaps or ski-style — is considered a part of uniform of the day and is usually decided by a unit commander at reveille , so the Russian soldiers aren't actually free about the way they wear their hats.
The invitation type determines the visa. A tourist invitation results in a tourist visa, a private visit invitation results in a private visit visa etc. Except for tourist visas, invitations are official documents issued by Russian government agencies and must be applied for by the person or organization inviting you. The invitation will include the intended dates of travel and the number of entries requires (1, 2 or multiple). The dates on the invitation determine the period of the ensuing visa's validity. If in doubt of dates, ensure that the invitation covers a period longer than the intended stay: a tourist visa valid for 7 days costs the same as one valid for 30 days.