If you roll around in the mud a lot, then yes, brown is available.
Alternatively you could dye a regular kit brown. Although, the FA have yet to announce a lucrative tie-up with UK dye kingpins Dylon, launching an England player endorsed range of high-quality, low-bleed dyes* so any colour alterations would probably invalidate any guarantee that comes with the shirt.
*Although perhaps they should…
Red Rooney
Orange Owen
Blue Beckham
Wright-Philips White
Lampard’s Lilac
Cole’s Colour-Fastner
And of course…
Wes Brown
and
Robert Green
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