I usually look for clothes in sales, there is a Twitter account called Man Savings, they put up links to many clothing and trainer sites, some very good bargains if you are quick.
Have you tried Get the Lable.com
Most of its crap but usually find something that’s ok
If you type 80s Casual Classics into YouTube, they have several videos discussing various brands and the like.
Great website if you’re looking for clobber, they supply a lot of films and tv shows.