In the 'Ganapati Atharva Sheersha', these shlokas describe him as --
एकदन्तं चतुर्हस्तं पाशमङ्कुशधारिणम् ।
रदं च वरदं हस्तैर्बिभ्राणं मूषकध्वजम् ॥
रक्तं लम्बोदरं शूर्पकर्णकं रक्तवाससम् ।
रक्तगन्धानुलिप्ताङ्गं रक्तपुष्पैस्सुपूजितम् ॥
Here, "रक्तवाससम्" means He is wearing Red Garments (Rakta Vasam).
In the Aarti (Marathi) by Samartha Ramdas Swami, it is described as --
लंबोदर पीतांबर फणिवरवंदना|
सरळ सोंड वक्रतुंड त्रिनयना|
दास रामाचा वाट पाहे सदना|
संकटी पावावे निर्वाणी रक्षावे सुरवरवंदना|
"पीतांबर" means yellow garment.
Since both the sources are authentic, I am in a dilemma as to which color should be taken into consideration.
Any hint?