There were three irish regiments in spanish service at the time of the french invasion. All three in light blue coats with pale yellow facings.
The Irlanda just as said above.
The Ultonia: collar, cuffs, turnbacks and shoulders in yellow
The Hibernia: lapels, cuffs, turnbacks and shoulders in yellow.
The cut was the same as the other spanish, swiss and neapolitan regiments in spanich service.