Professional, conservative, refined, and elegant -- I love this Elie Tahari "Taylor" linen-blend jacket with removable sheer tie. The three-quarter length cuffed sleeves are perfect for summer. The jacket closes via a single hidden clip at the front. It is made from linen, viscose, rayon and elastane; the matching removable scarf-tie also is vegan; and it comes only in the pictured black. $468; find it here.
The jacket matches Elie Tahari's "Theora" pants, made from the same vegan linen-blend of material. The pants are cleanly, crisply designed with a tab-front closure and a crease down the front of the leg. They also come only in the pictured black. $248; find the pants here.
Also, if you like Elie Tahari, check out these "Eileen" pants, which come in black and briar (a greyish brown), and which are on sale via Nordstrom for $148 (originally $248). They are made from cotton and elastane -- perfect for business casual days at the office or more dressy weekend outings.