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Federation IV Deluxe (Open Crown)

Size chart
Size Chart



Working out your size - getting it right the first time.

  • Do not use size charts or advice from other sites.
  • Do not simply convert US or UK size standards on our charts to a metric size. We provide the charts as guide, not as a rule.
  • Measure your head, different manufacturers have differing interpretations of size as happens across other clothing lines.
  • Measuring your head takes a few minutes and takes the guesswork out of the equation. Please use a dress makers tape measure and not a piece of string...
  • Size charts and advice are designed for Felt Hats (Akubra and Fedora) and Leather Hats (Barmah)
  • Always presume that a hat will shrink in size, they do not stretch over time.
  • Adjustment foam strips and detailed care instructions are sent with each hat. Enough strips are sent to reduce a hat by one size.
  • We happily exchange to anywhere in the world, but getting it right the first time is easier for all of us.
  • Ask us for advice, the advice we provide is based on many years experience in mail order and selling hats. We are happy to answer as many questions as you need to ask.

Fedora, Akubra and Felt Hats

The size chart below is a guide to equivalent sizes in other measures. If you are unsure of your head size, please remeasure your head in inches or cms.

  • We recommend re-measuring your head size in inches or cms and converting from the new measurement.
  • Place a tape measure above the ears, and take it around the widest part of your head. The tape should be firm but not too tight. If in between sizes, round up to the closest size, ie 56.2 should be 57, 57.7 should be a 58 etc.
  • We supply FREE foam adjustment tape or pads to adjust the hat to a perfect fit.
  • We supply enough tape to convert a hat a full size down, ie a size 58 becomes a size 57.
cm inches UK Universal USA
53 21 6 1/2 x-small 6 5/8
54 21 1/4 6 5/8 small 6 3/4
55 21 3/4 6 3/4 small 6 7/8
56 22 1/8 6 7/8 medium 7
57 22 1/2 7 medium 7 1/8
58 22 7/8 7 1/8 med large 7 1/4
59 23 1/4 7 1/4 large 7 3/8
60 23 3/4 7 3/8 large 7 1/2
61 24 1/4 7 1/2 x-large 7 5/8
62 24 1/2 7 5/8 x-large 7 3/4
63 24 7/8 7 3/4 xx-large 7 7/8


Barmah Canvas & Leather Hats


cm inches Universal
53 - 54 21 1/4 - 3/4 small
55 - 56 21 3/4 - 22 1/8 medium
57 - 58 22 7/8 - 23 1/4 large
59 - 60 23 3/4 - 24 1/4 x-large
61 - 62.5 24 1/2 - 24 7/8 xx-large


In the event of a hat not fitting we accept returns. If you still need assistance or want to double check the result please contact us at and we will be happy to advise further.



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Made from the finest quality felt Akubra offers, this hat is further finished to provide a smoother finish than the standard Federation IV. The sweat band is made from the finest grade leather making wearing a pleasure. 

The Federation IV is a world famous hat for its authentic pre WW2 design. The straight sided crown, cut-edge dimensional brim and its 38mm tall grosgrain ribbon contribute to a period accurate hat that is acquired by production studios all over the world. More important than all of that however is that this hat is a hard wearing, good looking companion that serves as a great everyday hat! 

Although we do not claim that this hat is connected directly to any movie franchise or production studio it is often procured to cosplay popular characters from the 1930's and 40s. 

The Federation IV is supplied in an open crown state. If you need inspiration for shaping of the Federation IV open crown, head over to our Instagram Reels. If you would like a shape applied to your Federation IV check out our new shaping service below! 


Sizes & Specs:

  • Black & Heritage Fawn: Size 55-63
  • Dark Brown & Moonstone: Size 55-64
  • Brim: 70mm (Front) x 63mm (Side), Cut Edge
  • 38mm Grosgrain Ribbon Trim
  • Satin Lined
  • Premium Leather Internal Sweatband
  • 100% Heritage Quality Rabbit Fur Felt
  • Made in Australia



If you would like to take the guesswork out of shaping your Federation IV we now offer a hand shaping service. Before leaving the store we will hand shape the Federation into a classic shape. The shaping service can be paired with any Federation IV combination of felt quality and colour.

To add a shape for your Federation IV, simply add a hat of your choice from above and add it to your hat box. Then in addition, add the desired shape below to your hat box.

*Please Note* We do not accept returns of shaped hats, if you wish to gain further clarification regarding your size, please do not hesitate to contact us. To help us choose the best hat for you, you can simply leave your exact metric head measurement in the order notes in the cart.