How to measure for the fabric
Measure the full top of the toilet seat them add 5 inches for the under
Measure the full top of the tank then add 6 inches all around for both sides, the front and under
Measure the full toilet tank from side to side and from top to bottom then add 3 inches to the top and 3 inches to the bottom. And 1-1/2 inches to the bottom for hem

How to measure for the sponge
For the toilet cover measure the top, no allowance
For the tank top measure the top, no allowance
For the tank measure top to bottom and side to side no allowance
Step By Step
1.    measure and cut the fabric for the toilet top as shown
2.    measure and cut the sponge for the toilet top
3.    measure and cut the bottom lining for the sponge
4.    follow cutting instructions for the tank and the tank top. down PDF picture gallery

Sewing
1.    serge or zigzag the edges
2.    use running stitch for the circle toilet top and the circle tank top
3.    follow sewing instruction in the PDF picture gallery
Note. The cut out for the toilet handle should be carefully position and mark before cutting, put the tank cover on and mark , then make a  long button hole about 3inches

three-piece-toilet-cover1

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In a next post I will show you how to make the bathroom floor mat and the shower liner cover.