Vintage tweed sacks still turn up. Including some real beauties. That's the nearest you will get with ease. I think blackwatch plaid may also turn up sometimes. Pure cotton sacks are far, far rarer. Indeed if you really want a cotton one then get it new or you'll be searching for many years.

For vintage sacks, you will almost certainly have to import. If the jacket is your size and a good one then it's worth it. Those things never wear out and look so much better than 99.9% of jackets available new in the UK. Try ebay.com, wait until you find a killer then suck up the customs charges.

Alternatively, contact this gent and tell him your size and what you're looking for: https://www.waterhollowtweed.com/

I've bought from him a few times and he's very reliable. He's an ivy fan himself so he knows exactly what we're talking about.

When JS moved into the new shop he had quite a lot of vintage sacks. Maybe he still does. Not cheap of course.

Please don't wear a sack jacket of any description with black or grey jeans though.

Or even blue jeans.

'Mm...  tasty...  waterhollowtweed...  Many thanks...'

A pleasure. I believe he started selling over on Ask Andy Trad (Jim's sworn enemies) and seems to find a lot of good stuff. A lot is ivy related rather than pure ivy, but he does unearth proper vintage sack jackets and suits on occasion.

Jeans of any description are more for mooching around the house these days.  Chinos and cords are for venturing out in.

CN2P on IG (Jesus, I'm getting the hang of it at last): our Gibson is wearing a jacket with a navy polo neck I rather like the look of.

I have bought from him (although I can't recall everything - definitely some wonderful Press ties) and you get what you're expecting.

I've never owned a Topster but they look good in the photos I've seen.

I had had my eye on two Don Richards jackets on Ebay.  Neither are suitable.  Pity.

A rather nice Hickey Freeman (italian made) has caught my eye.