Hi,
I've very recently been researching similar information, ready for painting up a 6mm mid-late Peninsular war Spanish army (from the Baccus 6mm British and French ranges). Rene Chartrand's books on the Spanish Army in the Osprey series are absolute gems!!
Anyway, using the Orbat in Oman's Vol IV:
The Spanish at Albuera
INFANTRY:
Murcia (1812 – blue jacket with yellow facings, sky blue pantaloons, black equipment)
Canarias (a provincial militia regiment? – 1810 – white jacket and trousers, red facings and piping, round hat; or possibly replace white with brown)
2nd of Leon (1814 – blue coatee and pantaloons, scarlet lapels and cuffs, white collar, turnbacks and waistcoats)
Campo Mayor (Light Infantry – 1814 – blue coatee and collar, crimson lapels, cuffs and turnbacks, white pantaloons, shako)
1st of Catalonia (1810 – Sky blue coat and pantaloons, white waistcoat, scarlet facings, round hat)
Barbastro (ex Tiradores de Doyle – red uniform, white waistcoat and breeches)
Pravia (1808 – Blue coatee and pantaloons, scarlet collar, cuffs and piping, white turnbacks)
Lena (1808 – Brown coatee and pantaloons, scarlet collar, sky blue lapels and cuffs, white piping, shako)
Castropol (1809 – white jackets with red facings, white breeches, white forage caps with a red band)
Cangas de Tineo (1808 – Brown coatee and pantaloons, straw-coloured collar, cuff flaps and piping, green lapels and cuffs, white pantaloons, grey greatcoat, black gaiters, shako)
Infiesto – ?
Spanish Guards (1811 – blue coatee, pantaloons and gaiters, scarlet cuffs, turnbacks and waistcoats, white lace, shako with red plume)
Irlanda (1814 – sky blue coatee and pantaloons, scarlet collar and cuffs, white piping, white pantaloons, shako – in 1809 at least, some may have been wearing old Bourbon uniform)
Patria (1809 – green coatee with green lapels, cuffs and turnbacks, scarlet collar and cuff-flaps, yellow piping, white waistcoat and breeches, shako with yellow band and cords and red plume [this uniform looks very French-style to me])
Toledo (1814 – blue coatee and pantaloons, yellow collar, cuffs and piping, white lapels, shako)
Legion Estranjera (might be the Cazadores Extrangeros Light Infantry unit – in which case – 1812 – blue coatee and pantaloons, yellow collar and cuffs, black gaiters, shako)
Walloon Guards (1811 – blue coatee, pantaloons and gaiters, scarlet cuffs, turnbacks and waistcoats, white lace, shako)
Ciudad Real (1814 – sky blue coatee and pantaloons, scarlet collar and cuffs, white piping, white pantaloons, blue greatcoats, shako)
Rey (1814 – brown coatee and pantaloos, violet collar and cuffs and lapels, white piping and cuff flaps, white trousers, shako)
Zamora (1814 – blue coatee with blue collar, buff lapels and piping, scarlet cuffs, brown pantaloons and greatcoats, short black gaiters, white trousers, shako)
voluntarios de Navarra (Light Infantry – 1814 – blue coatee, sky blue collar, green cuffs and turnbacks, white piping and pantaloons, black gaiters, shako)
More generally for Albuera, any combination of the following seems reasonable:
Coatee in brown, blue, sky blue or white (most likely red facings). Units suppplied from Galicia rather than Cadiz might get grey, but I think that the formations at Albuera would have been supplied from the South. I could certainly be wrong about this!!
Same colours for breeches
White or black equipment
Round hats, shakos (British, French or 'plain' style), or forage caps (as worn by the Castropol Regiment)
CAVALRY
Santiago- 'Heavy' cavalry regiment – 1814 – blue coat, scarlet facings, buff waistcoat and breeches, blue cloak)
Husares de Castilla – ?
Granaderos – ?
Escuadron de Instrucion – ?
The cavalry at this period is just as varied as the infantry. I think French Hussar styles and British Light Dragoon styles (i.e. with Tarleton-helmet) seem most common.
ARTILLERY
Blue coat with red facings, blue breeches/pantaloons and black gaiters, bicorne. This could be replaced by a brown uniform and a round hat might be worn instead of the bicorne.
Does any of this help?