The second most common set of uniform images indicate that many units also wore just the gorillo fatigue cap (basically the same as the French 'Bonnet de Police'). It is likely that many, if not the majority of the troops would have worn only sandals or been barefoot. Above you can see an original print of this uniform and below a more modern interpretation.
The reality of campaigning though means that before 1819-20 there was little uniformity either achieved, or if achieved, maintained. Reading "Conquer or Die" by Robert Hall, gives a good indication of how quickly the British Legion battalions became ragged and unrecognisable after only a few months on campaign. Additionally, because of the loss of troops due to disease, desertion and battle casualties, many differing units were brigaded to form new battalions, with a mix of many different uniforms, and new recruits without any.I will be putting up more images of uniforms as I receive them, with the focus very much being on primary sources. After the first unit of Gran Colombian figures in shakos are released we will be working on the sculpts for the troops in fatigue cap and sandals as represented in the images here. Of course all suggestions and requests are very welcome.