To extend the life of your suit, brush it with a suit brush every time after you wear it.
Better yet, brush it before you wear it too. Dust, dirt and even food particles can build up on the fabric of your suit, thus weakening them and shortening the life span of your suit. A quality suit brush is usually made with boar or horse hair with a wooden handle.
Brush your suit downwards with gentle and slow strokes so you won't damage your suit. It should take you less than a minute and this quick habit can ensure your suit long wearing life.
Ask your tailor for more details on where to get your suit brush.