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Use a measuring tape to measure all 4 sides of your table, then add them together. This will tell you how much elastic you will need to buy. You will need to buy enough elastic for all 4 sides of your table, even if it will be up against a wall. If your table is circular, wrap the measuring tape around the perimeter. Wrap 5⁄8 in (1.6 cm) wide elastic around the edge of your table. Tie the ends together in the back of the table with a double-knot, or overlap them and secure them with a pin. Pin the elastic to the tablecloth every 6 to 12 inches (15 to 30 cm) so that it doesn't slide off.  Match the elastic color to the tulle. Fold-over elastic is a great option because it comes in many colors. Wrap the elastic tightly enough so that it doesn't slide off, but loose enough so that you can still slide your finger under it. They are about 6 inches (15 cm) wide, and you can find them near the ribbon or wedding section of a craft or fabric store. If you can't find any, buy regular tulle off the bolt at a fabric store, then cut it into 6 in (15 cm) wide strips. Plan on getting 2 to 3 spools that are 100 yards (91 m) each.  You can  use all 1 color, or you can use multiple colors for a more interesting effect. For example, you can use light pink and dark pink instead of just light pink. Try a rainbow of colors: pink, orange, pastel yellow, mint green, pale blue, and light purple. For a more magical display, consider using sparkly or glittery tulle. Measure the height of your table first, from the floor all the way to the table top. Double your measurement, then cut your tulle into strips that match that length.  How many strips you cut depends on how much coverage you want on your table. Cut just a few for right now. Cut a piece of cardboard to the height of your table. Wrap the tulle around it, then cut the bottom edge to separate the strands. Take 1 strip and fold it in half so that the narrow ends match up. Slide the folded end behind the elastic to make a loop, then pull the 2 tulle tails through the loop to tighten the knot.  Make sure that the folded end is pointing down when you slide it behind the elastic, not up. The tighter you make the knot, the fuller your tutu will be. Make sure that the knots are touching each other. If you leave too much space between the knots, your table tutu won't be very full.  If you run out of strips, cut some more. If the table will be against a wall, you only need to cover the sides that will be visible. If a pin gets in the way, you may need to move it.

Summary:
Measure the circumference of your table. Wrap elastic around the table and secure it in the back. Purchase some spools of tulle. Cut your tulle into strips that are twice the height of your table. Secure the first strip to the elastic with a slip-knot. Continue to tie the tulle strips around the table until the elastic is full.