Should sixth form's have a uniform?

My sixth form has a uniform and I'm quite glad it does to be honest - it saves the hassle of finding something to wear every morning and because it's largely the same as the year 7-11 uniform (white shirt instead of a yellow one) it means money is saved as well.

I agree to an extent.
How do you feel about 6th forms where they wear suits?

I like the Sixth Form's where you get to where your own suit.
You don't have to look for something to wear everyday, you still look smart, and you get to add variation for the first time in an age.

With a large proportion of well-paid jobs being in the STEM category where suits would likely feature, I think that it's a good idea to get students used to wearing and being comfortable in suits. Especially for interviews.

However suits can't be really compared to uniforms... wearing a suit (I understand I'm perhaps stereotyping a little) can make you feel more adult, mature, confident... people in suits also tend to command more respect than those in nike tracksuits. There's also significant room for self-expression.

I would still (if I was setting school policy) make it "extremely advisable/ recommended" rather than blanket enforcement. It's important that students who hate wearing suits aren't necessarily forced into wearing one- people underestimate how much simply being comfortable when in a learning environment can help them focus and learn.

Some cheap points are being able to dress appropriately for the weather etc

Absolutely. If you look at the statistics every school in the top 10 results-wise has a uniform at sixth form. Students don't function properly not in uniform, they no longer view it as school and instead some sort of doss. If a sixth form doesn't have a uniform it is a sure sign that it is rubbish!

We had a basic dress code but no uniform. Basically you could wear what you wanted, within reason.

Sixth forms shouldn't have uniform. With younger kids uniform puts everyone on a level playing field and stops people getting bullied for having only cheap clothes. At that age it also teaches them to follow rules. At sixth form I just don't think it's necessary.