This is what ladies' baggy "pants" were called in English at the beginning of last century, but nowadays they are "baggy trousers", although I am sure some very old ladies would still call her panties "bloomers" (in English).

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Note added at 19 mins (2008-09-02 19:52:50 GMT)
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They can also be calle "culottes" (in English), although they went out of style some time ago. But it could be as well!

If the men's clothing terms are any indication, then this may well be about different period costumes (or attire), what with fraise meaning ruff (16th cen), for example. In that case bloomers are simply bloomers, IMO. (1848, invented by Amelia Bloomer)
Pictures:
http://dressreform.tripod.com/construction.html

However, if "fraise" now turns out to refer to something modern, then we'd be talking about:

Bloomer shorts

--worn by the wee ones and big girls alike (see photos at reference sites).

http://www.asos.com/No-Romeo/No-Romeo-Bloomer-Shorts/Prod/pg...

http://www.shopstyle.co.uk/browse/shorts/Miss-Selfridge#0_57

PS: if bloomers is the right answer, credit/points goes to Kashew, of course!


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Note added at 48 mins (2008-09-02 20:21:19 GMT)
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Misread, sorry: the "fraise", etc are of course for women, not men -- but that doesn't change my answer!

I don't actually know what they are referring to here, but I think "bloomers" is equally as ambiguous in English as in French, from what I've just seen on the Ouèbbhe.

In both languages they can be either "harem pants" (though possibly not with the crutch down to the knees as is the fashion), which is what the original bloomers were 150 years ago, or baggy shorts elasticated at the cuff which came about half way down the thigh, which is what girls wore for sports activities when I was a boy, in the 1960s, though they rapidly disappeared (from the fashion scene, rest assured, not from the girls). These "short" bloomers were generally blue and baggy, to conceal any curvaceousness. A total waste of time since we were none of us more than 9 or 10 at the time, unless the teaching staff were more aware of pedophilia in years previous than they were subsequently.

I suspect the "bloomers" in your text are more akin to these "gym bloomers", though prob. not elasticated at the cuff.

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Note added at 59 mins (2008-09-02 20:33:02 GMT)
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bloomers are a great alternative to wear under those short dresses, so you dont look like a slut.(that was kinda harsh, some girls can pull it off, ...
xalamodex.blogspot.com/2008/03/bloomers.html

Al'heure où les femmes hesitent entre la culotte et le string, le retour du mini bloomer se prépare doucement.
Sexy sans être vulgaire, confortable sans être mémére, le bloomer semble être l'une des meilleures options. Vous pouvez en découvrir sur [email protected]
http://forum.elle.fr/htm2/ni-string-ni-culotte-des-bloomers,...

Go see http://www.mamzellemargot.com/accueil/

On les confondrait presque avec des sous-vêtements et pourtant, les bloomers et autres micro créations se portent bien de jour… Autant dire qu'ils ne pareront pas les gambettes de toutes les fashionistas, même les plus ardues !
Plus aisés à porter, les bloomers ont fait une entrée fracassante sur le podium de Stella McCartney. Paré d'imprimés géométriques vert émeraude et bleu clair, le bloomer s'impose comme le support de toutes le fantaisies. Modeuses téméraires, la version moderne de la culotte courte vous attend dans sa version à pois chez Sisley et dans un tartan estival chez New Look. On peut toutefois commencer tout en douceur avec le bloomer beige créé par Maje pour la Redoute
http://www.linternaute.com/femmes/luxe_mode/tendances/0703-m... (with photo)

Other than looking a little tired around the edges, McCartney comes across as warm, funny, and stylish (today in white silk bloomers of her own design). ...
nymag.com/nymetro/shopping/fashion/features/n_7580/

In a different style (with photo also):
Geishas, dominatrixes, disco divas and even Marilyn Monroe - Madonna has imitated them all.
But with her 50th birthday approaching, it appears that the Material Girl is now plundering the more staid Victorian era for fashion inspiration.
She stepped out after her daily workout session yesterday wearing cut-off leggings, a T-shirt - and a roomy pair of pink and white lace-trimmed bloomers.
http://www.mailonsunday.co.uk/tvshowbiz/article-1024722/Bloo...

A month or so ago, Victoria Beckham left the house in a strange ensemble including a pair of Chanel Bloomers which looked more Michael Jackson than Haute Couture. Nevertheless, this Victoria Beckham wannabe saw the beauty in this outfit and got a custom made one to look exactly like that of Victoria Beckham's
queenoftheposhandbroke.blogspot.com/2007_08_0...