casual Friday

基本解释

Casual Friday - Depending on the business, this can mean anything from corporate casual instead of formal looks or "Wear your company logo polo and jeans." If in doubt, ask a superior.
随意的星期五：由公司性质决定，这可以是企业便服，而不是正式着装或者“穿有公司商标的服装或牛仔裤。”
Before you slip on a pair of weekday jeans, consider your workplace and what is appropriate—if you are a banker or a lawyer, you might be limited to twill trousers even on Casual Friday!
当你准备穿着牛仔裤去上班的时候，得先考虑一下你的工作环境，该穿什么合适。如果你是位银行家或者律师，那么只怕在休闲星期五这天也得穿着西装裤。
Many work place, has nonetheless also adopted the idea of a Casual Friday.
很多工作地点，也接受随意星期五的观点。

"I've had to mention low-rise jeans on casual Friday, " adds Cassia Anthony Yikes on Facebook.
FORBES
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In some companies, employees are allowed to wear clothes that are more informal than usual on a Friday. This day is known as a casual Friday.