When buying a suit, a classic suit that is meant to last a few years, there are a few factors to consider.
The cut must be contemporary and not overly fashionable; you don’t want it to look dated before its second outing. It should be in a colour you will wear and not go off, and one that matches other colours and can carry a plain or a patterned shirt and of course, a waistcoat. Try black, charcoal grey or navy.
The fabric should take you through at least two seasons, spring / summer or autumn / winter and it needs to be a quality fabric, like these from the Loro Piana mill for example, that will wear well, withstand sitting and is dry clean rather than machine washable. Some of their fabrics has a mild stretch element and if you choose your colour wisely, it can be as versatile as Lupin.