There are many costumes in Brittanny, by some counts up to 66, but I will not be able to show them all, in fact I have not found images for all of them. They are also not evenly distributed, there being more costumes and more elaborate and colorful ones in the west.
The four best known and most elaborate costumes are all from the western part of the province of Gernew [Cornouialle]. I will start with these.
Giz-Fouen costume from the region of Rosporden and Pont-Aven.
I have already done an in depth posting on this costume. Here is the region and the costume itself.
Bigouden Costume of Pont l'Abbe.
This is perhaps the most famous costume and embroidery of Brittany. Here is the location of the region.
The photograph at the top of the article is of a professional embroiderer's shop in this region.
You can see the masses of embroidery on the garments they are working on. I find it interesting to see men also engaged in the embroidery. The costumes they are wearing are those of the end of the 19th cent. Here are a couple of photographs, even today some people prefer the old form of the costume.
During the early part of the 20th century, the coif continued to grow until it reached monumental proportions. This continued until the advent of automobiles made it inconvenient. The skirts shortened, and the aprons became white with free-form embroidery.
The Glazik costume of Kemper [Quimper]
This is another well-known costume of Brittany, often featured on the famous pottery of the area. Here is the location of the region.
Here is a group performing at a festival in Poznan', Poland.
[This photograph is taken from the book 'Ethnic Dress' by Frances Kennett, In the book she implies that this is a Polish dance group, which it clearly is not. Most general books on folk costume, even good ones, have at least one such glaring error. Make sure you check multiple sources.]
The exact form of the embroidery, especially on the men's vests, varies by the town.
This costume has several variations, some of which are quite reserved.
A jacket for the men is part of the costume as well.
Alternatively, some versions of the costume are very colorful indeed, as this example from Kerfeunteun.
The Costume of Plougastel-Daoulas
This is one of the most colorful of all the costumes of Brittany. It is only found in the one city.
Here is an older form of the costume. Notice the rich lace and embroidery.
Here is a more recent form.
The province of Leon.
This costume is found in the regions of Brignogan and Plounéour-Trez on the mid-northern coast.
Kerlouan, just to the west of the above region, is famous for the cone-shaped coif.
Saint-Pol-de-Léon in the northeast corner.
The Province of Tregor
Tregor is characterized by a small coif with two narrow wings, called the touken.
There is also a larger coif called the katiole.
The Province of Gwened or Vannes.
This province is named after Gwynedd in Wales, another remembrance of the roots of the people of Brittany.
The costumes of Gwened or Vannes are characterized by a coif in which the front has developed a flat shield-like shape. Here is an example from Auray.
The costume of the Island of Groix, in the Lorient region.
Sometimes the entire coif is made of lace which covers the side of the head. Here is the costume of Baud.
Sometimes the pinafore apron is highly embroidered.
The dances here are just as active and spectacular as in other parts of Brittany. This is the Groupe de Pontivy performing the Gavotte du Pays Pourlet.
There is much less costume material available from Upper Brittany. There is also much less variety in the costumes. I here present what I have been able to find by province.
The Province of Sant Brieg [in French, Saint Brieuc or Penthievre].
Province of Sant Malou [Saint Malo]
Province of Roazhon [Rennes]
Notice the coif has the side lappets folded over the top and pinned in place. Also notice the triskelion on her neckband. This is a very Celtic symbol and one of the National symbols of Breizh [Brittany].
Province of Guerande
This is a small province with a very colorful and unique costume. This is known as the costume of the Marsh-Dwellers.
Province of Naonaid [Nantes]
When the French Government instituted the Departements [administrative regions] to replace the old traditional Provinces, they removed the Bro-Naonaid [pays de Nantes] from Brittany and made it administratively part of the Departement of Loire-Atlantique. The people of Brittany still consider it to be an integral part of their land, however.
Historically, the women of Nantes wore a very high coif, somewhat reminiscent of those of Normandy. Here is an image of a couple of girls from Pornic, mid 1800's.
Here is the costume of a folkloric group in Vertou. They did a very good job of researching their local materials to make this outfit. You can see many details on their website.
A children's perfoming group from Jans. As in many children's groups from many countries, the skirts have been shortened far beyond what any adult would wear. A simple bonnet is worn instead of the adult coif, which is common in many areas.
Coif and costume from the area of Clisson.
Town costume of Nantes itself as presented by the performing group Bleuniadur.
I would like to emphasize that this is not a comprehensive listing. There are yet other costumes which I have not covered.
Thank you for reading, I hope you have found this interesting and informative.
Joseph Jigourel - Yanna Fournier, 'Costumes de Bretagne', Brest, 2000
Pierre Jakez Helias, 'Coiffes et Costumes de Bretagne', 1983
Bruno Helias, 'Breton Costumes', Florence, Italy, 1997
V. Hetet-Roudaut et al, 'La Broderie en Bretagne', Morlaix, 1989
Andre Sainsard, 'Costumes Folkloriques Provinces Françaises', Paris, 1972
Royere, Gardilanne, Moffat et al, 'Les Costumes Regionaux de la France', New York, 1929
Charles-Brun, 'Costumes des Provinces Françaises', Paris, 1937
P. Leroux, 'Costumes Regionaux', Paris, 1940