Don’t confuse club attire with business attire. If you would wear it to a club, you probably shouldn’t wear it in a business environment.
Wear a two-piece matched suit.
Suit – trousers / skirts:
Tailored trousers suits are appropriate for women. Trousers suits can be an excellent choice for site visits, particularly if the visit involves getting in and out of vehicles and/or the site is (or includes) a manufacturing plant or industrial facility. If you wear trousers, they should be creased and tailored, not tight or flowing.
Much of what you see on TV/movies that masquerades for professional attire is not appropriate for a work environment. Your skirt should cover your thighs when you are seated. Showing a lot of thigh makes you look naive at best, foolish at worst. A skirt that ends at the knee when you’re standing looks chic and professional. Longer skirts are professional too; just make sure they are narrow enough not to be billowing, but not so narrow that you can’t climb stairs comfortably. Don’t purchase a skirt or decide on a hem length until you sit in the skirt facing a mirror. That’s what your interviewer will see, and what others will see when you are seated in a waiting area prior to your interview. Ask yourself whether it will be distracting or reinforce your image as a person who looks appropriate for a business environment or gathering. High slits in skirts are not appropriate. A small center-back slit in a knee-length skirt is appropriate. On a calf-length skirt, a slit to the knee to facilitate walking and stair climbing is appropriate. Practice walking, climbing stairs, sitting, and standing in your skirt with the shoes you will wear. Make sure you don’t have to adjust or tug your skirt into place when you move.
Colour / fabric:
Navy, dark grey, and black are safe. Other colour trends may come and go; avoid the extremes. Women generally have more options with suit colour than men. For example, while a woman could look conservative in a light grey suit, it would be more casual for men. Choose a solid or very subtle weave pattern or plaid (the type that looks solid across a room). Wool, wool blends, and high quality blends and synthetics are appropriate for women’s suiting.
Shirt / sweaters:
Underneath the suit jacket, wear a tailored blouse in a colour or small print that coordinates nicely with your suit. A fine gauge, good quality shell (sleeveless) or sleeved knit top (not bulky; not thin or gauzy; not a t-shirt) is also appropriate underneath your suit jacket. Don’t show cleavage. (Remember that tv/movies are trying to attract viewers; they don’t represent reality of the professional environment.)
Jewellery / accessories:
Wear a conservative watch. Jewellery and scarf styles come and go. Keep your choices simple and leaning toward conservative. Avoid extremes of style and colour.
Keep makeup conservative. A little is usually better than none for a polished look. Nails should be clean and well groomed. Avoid extremes of nail length and polish colour, especially in conservative industries.
Should be leather or fabric / micro fibre. Shoe styles and heel heights come and go. Choose closed-toe pumps. Regardless of what is in style, avoid extremes; no stilettos or chunky platforms. Make certain you can walk comfortably in your shoes; hobbling in uncomfortable shoes does not convey a professional appearance.
Should be plainly styled (no patterns), sheer is most conservative (not opaque), and in neutral colours complementing your suit. Dark, matching your suit and shoes is appropriate in colder weather. Avoid high contrast between your suit and hosiery colour. Do wear hosiery in cold weather!
Purse / bag:
A business-like tote bag is ideal for interviews and other professional occasions. It can carry your portfolio, extra copies of your CV and any other papers you might need, and personal items can be concealed within. A structured tote that will stand up when you set it on the floor is preferable to one that flops over (and potentially spills its contents). If you also carry a purse, keep it small and simple (so that you are not carrying two large bags); you might place your smaller purse within your larger tote. Tote/purse color should coordinate with your overall attire; it does not have to match your shoes, but should not clash in style and colour. Your tote/purse can be leather, faux leather, micro fibre or a fine woven material. Avoid purses that look like beach/pool totes or have bold prints.