Do not take too many clothes. Choose items that coordinate with everything else. Use one or two colors as your main focus, and coordinate everything else accordingly. Fabric is important. Choose fabrics that breathe - cotton, silk, and linen.
Freedom of movement needs to be considered when selecting skirts.
There will be a lot of climbing in and out of buses, stairs, and touring a variety of plants. I suggest consulting the itinerary each night to plan appropriate attire -business suits for company headquarters visits and business slacks for plant visits. Comfortable shoes are a must - flats and walking shoes. If you prefer heels, be sure they are comfortable. Hose are necessary for business attire.