Frankly when HoI4 came out I was appalled at how little effort was invested here.

I can have a look yes, just post it on Dropbox or google drive and shoot me a link

Here you go:
https://drive.google.com/open?id=1oebukdK5cdG6DZ1Tuagwaxq-52V56j-t

I went by what flag was most historically likely to be used according to the party/leader of the ideology, at that time period (1930s/1940s).

Latin America didn't quite come up in any great detail.

The Canadian flag should be the "flame" version...

@dIRECTOR There are a few good ones in here, however a large amount of them have the wrong colors, have a Hakenkruez on them for no reason and alternative-designs when historical ones were in use. I will use a few though but most of them seem fictional and are not based on history to be honest.

I don't know what you're talking about..

All of them have the EXACT accurate colors. The best we can manage, anyway.

Give them a good looking-over at least, would be my recommendation. I did of course use fictional flags where I absolutely had to, but I based them on what we would most likely have seen.

When missing historical nazi imagery - use a swastika. That at least is period historical.
This is silly, why use a symbol for movements that were not nazi, e.g. the Centre Party, Azad Hind etc. Whilst these movements may have had sympathies with the NSDAP they did not share the same ideological beliefs hence would not utlise a random swastika on their flag it makes no sense

Would the Silver legion change the US flag...? Unlikely.
The Silver Legion looking to return to an greater USA could very likley alter the flag to further emphasise their nationalist tendencies hence why I changed it

British Communists would IN NO CASE have used the Christian/royal symbolism of St. George/Andrew/Patrick.They would use their party flag.
Similarly to france the Union Jack is a symbol of the UK not just the monarchy. I personally highly doubt they would abandon the design. I also can't find any decent designs or make any that make me go ahah

The British Union of Fascists most likely would not have changed the flag (just liek Mussolini), but if they did, they would use their proper party flag.
Mussolini wanted to put a fasces on the Italian flag but was not able to do due to monarchist opposition. Going off Mosley's views I wouldn't see it as impossible for him to incorporate the Flash and Cricle into the Union Jack

The DDR flag is unrealistic for GER. Should be the flag of the KPD.
Again when Paradox add some more focus to the DDR and GDR I will adjust the flags

The Canadian communist flag would necessitate there being a flag change first to the maple leaf. That didn't happen until well after the war. I'd look for the flag of the Canadian Communist party.
Well I am using the Canadian Communist Party flag if you don't believe me you can check here https://flagspot.net/images/c/ca%7Dcomm.gif

Use the flag of the Italian Communist Party for the communist Italy flag.
I would prefer to use a state variant of the Italian flag, rather that a party flag if I can help it

Using the flag of the Taliban for the AFG fascist flag is just silly..
Yeah I am not happy with this flag either

You're using the modern French colours, which aren't accurate for that period... the blue was darker back then, the red was... more saturated.
the colors you are talking about were not utilised until 1974

The fern flag of fascist NZ is just cute :).
I it based on a historical movement rather than put a random swastika on it

Please reply here if you have any more questions

The swastika was a symbol used by "Aryanist" movements. Iran and India had much of that sentiment. So did Australia, Canada (Canadian nazis used it before the flame thing), and New Zealand. As well as all of the Nordic countries. Hence I preferred them over a totally fantastic flag.

The Silver Legion... would not have changed the US flag. Not much more to be said. They're reactionaries much more than revolutionaries in character. And its preferable not to change the flag if you have absolutely nothing to go on. If you really want to change it, use their party flag.

They would absolutely abandon that design. That is total nonsense. Christian crosses on Communist flags? Please... the thought is laughable.

And in the UK just like in Italy: monarchist sentiment would go against changing the flag. BUT, if they were to change the flag - they would have changed it to their actual flag (like the Nazis upon whose flag theirs was based).
The superimposed lightning bolt over the Union Jack is ahistorical and absurd. Its not "impossible", but then few things are...

The Canadian-Communist maple leaf flag was based on, and adopted after - the introduction of the actual national maple leaf flag. That flag is from the future.

Why would you prefer a defaced flag rather than the party flag? When all revolutionary movements in the period just replaced the national flags with their own party flags. The Italian communists would not have used the reactionary burgeois tricolour. Not at that time. The practice of superimposing communist symbols on flags is primarily a post-WWII phenomenon. Most communist movements just used their party flag or a completely different flag variant.

For afgh fascists I use this:
https://upload.wikimedia.org/wikipedia/commons/3/3f/Flag_of_Afghanistan_%281974%E2%80%931978%29.svg
Which actually was a flag of a kind of modern-style dictatorship. I think its the best we can do.

Re the french flag... quite the opposite. You're using the modern colours, I'm using the older ones.

As regard AST and NZ there isn't much we can do that makes sense. The supposed AST fascist flag used now has notthing to do with AST fascism... and the fern flag is again... just silly. I figure if Canadians used the swastika (before the torch) it would make sense for the AST and NZ to use them...

The movements represented in HOI4 specifically in the countries you mentioned are not Aranyist in the slightest, The Centre Party and the New Zealand Legion had none of the core tennants from the Nazi movement and where pro-monarchist but with authoritarian views (a fault with Paradox's research). Azad Hind only sought collaboration with Nazi Germany to gain its independence from the United Kingdom otherwise it was relatively left-wing. As for the National Unity Party I would prefer to use the flame flag instead of the Hakenkruez flag because it is more distinct.

Given the strong patriotism of the Silver Legion, I would highly question them using their party flag as a basis for the state. As mentioned previously the Legion seeks a renewal of the American Constituion with religous vigor I figured if they were to change the flag they would go for a more nationalistic variant of the stars and stripes hence the new design.

Many of the Warsaw Pact Member flags are based from Monarchistical designs around religous beliefs, as such I can see the UK going communist and retaining their traditional flag

Yes, but having the Flash and Circle by itself would also be ahistorical, I figured given Mosley's extreme patriotism for the UK, he would retain the traditional flag but with his symbol.

The Maple leaf was a very notable symbol even before we adopted our flag in 65, It wouldn't suprise me for them to utilise that flag. Although if I am wrong can I have a source?

I have another idea for a fascist flag

No its the opposite like I said before the colors you sent me were not defined until 1974.

See the top, I would rather use historical designs than a swastika on a background.