Zegna suits tend to run true to Italian sizing, which typically means about one size smaller than American or British equivalents. A Zegna 52 (Italian) is roughly a US/UK 42. The chest tends to be accurate but the trouser rise on older pieces can be shorter than contemporary buyers expect. Jacket sleeves on pre-2010 pieces often run longer. Measure the actual garment from listing photos or ask sellers for point-to-point chest and sleeve length before buying.

Zegna is counterfeited far less than logo-driven brands, but misrepresentation of tier is more common than outright fakes. Check for the woven interior label specifying the cloth (Trofeo, 15milmil15, etc.) in the chest pocket, a clean floating canvas construction when you pinch the lapel between two fingers, and a fabric composition tag in the correct Italian format. Sellers listing 'Ermenegildo Zegna' on post-2021 pieces or 'Zegna' on pre-2021 pieces are usually just confused about the rebrand, not being deceptive, but it is worth clarifying the actual production year.

It depends on where the wear is. Trofeo and high-twist Zegna wools can develop seat shine and elbow wear before the rest of the suit looks tired, and those are difficult to reverse. Lapel roll that has gone flat can sometimes be re-pressed by a good tailor, and minor fraying at cuff edges is a cheap fix. A suit with clean cloth but an outdated silhouette is a better buy than a suit with damaged cloth in a current cut.

Same company, different era. The brand traded as Ermenegildo Zegna until 2021, when it rebranded to simply Zegna as part of a repositioning toward a more casual and fabric-focused identity. Garments made before 2021 are labeled Ermenegildo Zegna. Post-2021 pieces say Zegna. There is no quality difference implied by the name change, but the product focus shifted away from traditional suiting toward sportswear, knitwear, and the Oasi Cashmere line.