casual attire is generally considered more relaxed and less formal than dressy attire. for a first date –

What To Wear on Your First Day of Work

it is extended to a group/class of persons generally exercised by

Business casual for men: Style guide and examples of outfits - SEEK

Best Dressy-Casual Outfits For Women

What Is Business Casual Men's Clothing? - Mainline Menswear

Casual wear - Wikipedia

What Is Formal Wedding Attire? Here's What to Wear

Dress your best: a guide for men's business casual fashion - Jobstreet Singapore

Smart Casual Dress Code For Men Explained - Quick And Simple

What is casual formal? - Quora

A full, BS-free breakdown of how to do smart-casual

Smart casual outfit ideas: How to navigate this dress code

How to tell if something is formal or casual dress code - Quora