The items had been expected to go under the hammer for £800 each but got bidders hot under the collar at auction.
They were snapped up by the same British buyer who was desperate to get their hands on them.
The white undies have Braun’s monogrammed initials embroidered on them and a label stating they were knitted in Bavaria in 1944.
The pants are in good condition but do show signs of age with a number of foxing marks.
They sold for a hammer price of £3,000 but with fees added on the price paid was £3,700.
The white frilly lace nightshirt that also bears Braun’s monogram sold for a total of £2,600.
Both items were sold by a collector of World War Two memorabilia who has had them for over 50 years.
They went under the hammer at Humbert & Ellis Auctioneers of Towcester, Northamptonshire.
Auctioneer Jonathan Humbert said “There continues to be a perennial interest in personal artefacts from such notorious high-level figures of World War Two and accordingly such items, even without provenance, command high prices.
“We were taking bids for them last week-long before we opened the auction.
“Both items will be kept together as they were bought by a UK based telephone bidder.
“It is a stunning result for us and our vendor was equally gobsmacked.”
Eva Braun met Hitler in 1929 when she was 17 and he was 40 and became his lover.
By 1936 she was part of his household but did not attend official events with him.
In early April 1945 when the war was lost, she travelled to Berlin to be with Hitler.
They were officially married in the dictator’s bunker and the following day both committed suicide, she by cyanide and he by a gunshot to the head.
In the same auction a gold-plated bracelet given to Hermann Goring’s wife Emmy dating to 1938, sold for £1,850.
The bracelet has a central locket with a Swastika and opens up to reveal a picture of Hitler – Goring’s close associate.
Braun met Hitler in 1929 when she was aged 17 and he was 40.
The pair killed themselves in a secret German bunker days before the end of