Sift the flour and salt into a large chilled mixing bowl. Cut the butter into 1/2-inch or smaller pieces. Dip your fingers into a bowl of ice water and dry thoroughly. Quickly crumble the flour and butter together or cut with a knife and fork until the mixture resembles coarse cornmeal.
Combine ice water and vinegar and sprinkle, 1 tablespoon at a time, over the dough while tossing it with a fork. Quickly form the dough into a ball and turn onto a lightly floured board or pastry cloth. Dust the ball lightly with flour if it sticks.
Wrap the dough in wax paper or plastic wrap and chill until firm, about 30 minutes, or longer if time allows.
To form the pie crust, place the dough on a lightly floured work surface or pastry cloth. Lightly dust the rolling pin with flour, and roll the dough into a 12-inch circle no more than 1/8- inch thick, rotating the dough as you roll. If the dough sticks, dust it with a little more flour, or lay a sheet of wax paper over the dough and then roll it out. If the dough begins to ooze butter, chill for 5 to 10 minutes.
Lightly flour the rolling pin again and carefully roll the circle of dough around the pin, lift up, and unroll the dough onto the pie pan. Do not stretch the dough. Use your fingers to fit the dough snugly into the pan. Using a kitchen scissors, trim the dough to 1/2- to 3/4 -inch below the edge of the pie pan.
For a pretty border design, roll up the dough on the rim of the pie pan and pinch all around with your fingers, making a flute design. Or, press trimmed pastry flat against edge of pie pan and notch the edge with the back of a fork.