For your clothes to last longer and be worn more often, it's beneficial to know a few easy mending tricks and have a basic sewing kit on hand. Minor damages like small holes can occur unexpectedly, whether from fabric snags or poorly sewn seams, even in high-quality garments.
For travel, consider preparing a practical BASIC KIT with the following items:
Include cotton/polyester REELS in a shade that matches or is slightly darker than your most frequently worn everyday clothes.
Pack small, sharp sewing SCISSORS.
Have a BAG with the spare BUTTONS that are usually found on the inside of shirts/cardigans/coats/jackets, when purchased.
Include a variety of NEEDLES in different sizes, ranging from fine for silk/cashmere to thick for bulkier woollens.
Don't forget a small box or cushion of PINS for securing seams.

BUTTON SEWING:
Ensure the thread colour matches the button fastenings.
Select the appropriate needle size.
Double the thread, knot and start from under the button, from the inner side of the garment.
For a sew-through button with four holes, sew from one hole to the opposite side five times, then criss-cross over five times through the other two holes (creating a criss-cross pattern on top of the button).
Wrap the thread around the existing thread, between the button and the garment, a few times.
Secure the thread underneath the garment to finish.
SOCK OR WOOLLEN GARMENT DARNING:
Match the thread colour to the fabric (slightly darker if an exact match isn't available).
Weave a mesh by using a loose running stitch back and forth across the hole area, sewing at right angles.
Loosely fasten on and off to prevent fabric pulling.
HEM MENDING:
Begin by ironing the hem to create a clear line where the hem should be.
Sew down any loose ends of the existing thread, where it has unravelled.
Match the mending thread colour to the existing thread, as closely as possible.
Start the thread from the underside, overlapping the unravelled stitching.
Use an 'invisible' stitch by picking up a few threads on the outside of the hem and longer stitches on the inside.
Secure the thread when you have created an overlap with the existing stitching.