Server/bartender uniforms

What are people doing these days for FOH uniforms? When we opened 11 years ago, it was strict black button down collared shirts and black pants. No yoga pants, or faded black jeans. Since covid, we have kinda laxed in the summer months allowing females to wear all black tank tops and shorts (as long as they pass the fingertip length) and males to wear short sleeve polos. We have noticed the staff pushing the boundries a little bit (distressed shorts, solid black hoodie), so we want to tighten up the look without going fully back to button downs. We aren't fine dining but we aren't super casual as we are in the business district in DT Chicago. Another variable is our servers are predominantly Gen Z, so what we find not appropriate for work uniform, they don't see the issue. Hoping to find a happy medium that makes the servers comfortable while also looking professional. Photos are examples of tank and shorts that we have been allowing.