Shortening is a possibility.
But maybe you don't need to.
How much excess length is there in the legs? Crotch to floor.
How much excess length is there in the torso? Crotch to shoulder.
Front zip or back zip?
Telescoping torso design? If not, could it be?
I'm about an inch shorter than the low end of the recommended height for my DUI trilaminate suits, but they had a 4-inch range. So that means I've got about 5 inches of overall excess. No problem for me.
The legs are about 2-3 inches longer than I need, so I fold them over at the knee similar to the so-called "telescoping" fashion.
The DUI are designed with very long torso for ease of donning and then the torso "telescopes" over itself to take up the excess.
If your suit can do that, you may get by.
Can you post the make, model, size range and your pertinent measurement data?
That might help someone provide a more specific answer than mine.
Oh, and how much of a bargain is it?
I love shopping with other people's money.
Dave C