Make sure your quilt will look straight. Stand directly in front of your quilt and focus on the exact center. If possible, take the picture outside. If you do not have professional lighting, the lighting outside is often the best and easiest, but be aware of the wind blowing the edges of your quilt so they do not look straight. A photographer defines open shade as not direct sunlight, but daylight reflected from a clear sky.
Direct sunlight can be very harsh which distorts details and washes out colors.
Avoid heavily overcast days. Use the right film. Consider using ISO 200 film. This film can show details better. Hold the camera very still.