Don't wear neck chains unless you know they are accepted by your firm. Don't wear earrings. Wear solid colors, preferably in the same color range, from head to toe. Avoid stiff fabrics and nubby textures. Wear darker tones in smooth fabrics with flat finishes.
Limit stripes to very fine, subdued, and close-together versions.
Wear two-button jackets with natural shoulders. Wear trousers with vertical pockets, which are more slenderizing than slanted pockets. If needed, wear suspenders. Choose suspenders with buttons instead of clips. Wear hemmed, not cuffed, trousers.