Suit Pants Alteration: much like suit jackets, achieve an ideal fit by balancing a few different parts of the garment. For suit pants, the balance is created in the waist, the hips(or seat), and the Crotch (or rise). When you’re buying suit pants, make sure first and foremost that the Crotch (or rise) fit best, as this will be the hardest alteration to do
Although an easy alteration, there is a threshold as to how much the Waist. It can be opened depending on fabric allowance in the Waist, and the area where it adjoins the center seam in the back of the hips.
The limit here is typically around 1.00 – 1.50 inches in either direction.
After this margin, even if you have extra fabric allowance, you may run into complications with the positioning of your back pockets.
Lengthening or shortening: This alteration involves either lengthening or shortening the hem of both pant legs. During this process, your tailor can create a pants cuff if that is more your style. We typically forgo cuffs for a more modern look (and streamlined to make your legs look longer). However, we acknowledge that they’re a classic feature and are always “making a come back.”
If you do ask your tailor to create cuffs, get cuffs with a height of 1.50 inches.
If you’re below 5 foot 10 inches tall, and a height of 1.75 inches if you’re taller, that way, the width of your pant cuff will be proportional to your body. This can sometimes be considered a moderate level alteration. The reason for this has to do with your expectations.
While any tailor can do this alteration. Only a skilled tailor can do it
without showing visible stitching on the outside of the pant legs. This may not be your concern, and if so, you can safely ignore this caveat.