This pattern is compliments of Jay Owen in Castro Valley, California.

Expand and Print the image above:

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Text instructions for the image above:
MGA Side Curtain pattern for vinyl covering

First, get an old sample or find the best pictures you can of how the finished side curtains should look. Otherwise the pattern won’t make sense. I made some practice runs with cheaper vinyl to get the process down.

You will need a good sewing machine with a heavy leather needle and heavy upholstery thread. Also two sided tape and clips help to hold things in place and straight as you sew.

The order of assembly follows the order of the lettered seams.

Draw the 3/8 inch seam lines on the back of the vinyl pieces to guide the sewing. Assemble all the parts inside out, sewing through the backing with the vinyl surfaces face to face. Sew to the corners and back stitch so it won’t unravel. All the 3/8inch seams are done this way. Then trim all 3/8inch seams down to1/16-1/8inch after stitching except for G and H which gets trimmed to 1/4inch to help form the raised ridge across top and rear.

Now turn the cover vinyl side out and use a seam roller to flatten the seams. Insert the two stiffeners and sew the 1-1/4inch flap seam. You will sew through the top part of the stiffeners. Set up an edge guide on the machine to make the seam nice and straight.

Trim and fold the A and B seam to minimize the thickness of the raised edge created in this next step. Sew the double row stitch that runs across the top and down the back, widest seam first. Then the narrow stitch around the edge of the bottom flap. An edge guide on the sewing machine is needed here also.

This pattern should fit the frames snugly with plenty of extra to trim and tuck into the frame. Pull and stretch the covers to align the bottom flap to the outside and the top and rear ridge to the inside of the frame. The ridge will cross from the inside to the outside of the frame just before it meets the bottom flap. It helps if the vinyl has some stretch to it.

Tech info from Todd Clarke (Clarke Spares And Restorations) shows the side curtain fabric cover as seven separate pieces stitched together.

On May 5, 2023, Alexander R, from Bathgate, West Lothian, UK wrote:
"I have the original side screens from my 1600 Tourer; there are indeed seven pieces of fabric. Only the covering for the front upright is a wrap. The coverings for the rest of the frame consist of two pieces of fabric, one for each side of the frame, stitched together. -- Don't forget that the covering material is much thinner than the material used for the hood and tonneau covers".