Below is a skirt I made for myself. I did not press if before I took the pictures. You can see that is is basically just a straight skirt with a sweep in the center back.
This organza layer was attached to the lining, so it is not the full length of the skirt. You can also see that the lining is the straight skirt with a slit in the back. I did not add the fishtail to the lining.
A thread chain holds the organza layer to the skirt.
I like to start the fishtail just below the bottom of the hips. The tail swings out as you see below. Please do a muslin to see if you would like a fuller sweep. But, this is really all there is to it.
If you would still like a straight skirt, but more of a train affect, begin at the side seam of the back skirt and taper down as you see below to achieve the desired length of the train. This can be bustled once the ceremony is over.
I hope this helps Miss Pdiddly!