How to dress like a professional on hot summer days Some unlucky office workers are stuck wearing the same clothing year round: business suits. But for much of the workforce, summer means a new freedom in what to wear to the office. Cotton will be the predominant fabric of the season, but others like linen and seersucker will also sneak into your wardrobe. We broke down the appropriate office attire for every level of workplace dress code, from casual to traditional. If you want to look professional in the summer time without overheating, it’s important to make a few changes to your work wardrobe. gone are the wools and tweeds of winter, and in their place are cooler, breathable materials like cotton and linen.formany, the summer office dress code is more relaxed and offers more freedom with materials and color.its important to note that the freedom that summer affords doesn’t typically apply to important client or boardroom meetings.