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Much of the tailoring to our curtains was to get rid of the excess ends that will literally fill your tub.  Being that the shower area is much broader than the tub, The curtains at the feet will be forced to conform to the  dimensions of the tub.  This excess got in our way and made the shower seem even smaller.  We fit the bottom portion of the curtain to the dimensions of our tub then removed material from each corner.  Each corner was then restitched.  

As to shortening the curtains, I don’t think we had to shorten ours.  We did fold the bottom edge outward and sewed it together to make a casing (ask your wife what a casing is) through which we ran a weight rope.  A weight rope is a string of 1/4” metal balls (lead? non rusting?) that due their weight and the force of gravity will keep the curtains in place.  Their downward pull will help close the opening and thus prevent water spraying through. The amount of fold in this casing could help you tailor the length of the curtain so that it is just the right length.  We didn’t wish for the curtains to drag on the bottom of the tub.  Being that the curtains do originally reach the bottom, they could be shortened to about two or three inches from the bottom.  

Our final move was to place matching velcro (hooks and loops) in four places.  
     2 pieces across the top to hold the curtain together
     1 piece about four inches down from the top
     1 piece about door knob height to keep the curtain together.
You could add more if you like but due to the effect of the rope weights haven’t found any more to be necessary.

We also attached matchiing pieces of velcro to the side walls. Each piece is to hold the curtain to drape  open (just like in the movie Gone with the Wind)  to air out the shower and curtain.  To place these pieces precisely on the walls, you swing the curtain open and toward the wall.  Where the door knob piece of velcro touches the wall, that is where you put a matching piece of velcro.  This is all spelled out in our brouchure