Possible Clues:

• What blows round and round in narrow opening
• Cotton twill that's fine for a Native American
• Current fabric fine
• A warm dry wind for the helicopter?
• Indigenous American's trousers not quite acceptable
• Boeing’s CH-47, a double rotor helicopter
• Wind in church from one alcove
• Outstanding feature primarily of go-ahead Native American
• Wind round and round, in crack
• Pacific Northwest native