A practical question about personal palettes

Miasa

I am helping organize portraits for library volunteers, and choosing a useful background has become my small planning task. The volunteers have different wardrobes, and asking everyone to buy a matching shirt would defeat our modest approach. We could borrow a blue backdrop, but I am uncertain how much that surrounding color might affect our comparisons. The camera settings and lighting would stay consistent while we compare a few fabric samples before deciding. Some volunteers are curious about personal palettes, which is why I bookmarked color analysis quiz as a starting point for questions, rather than a rule for the group photograph. Is it more practical to test the intended clothing first and choose the background afterward? I would appreciate a simple method that respects individual choices and keeps the whole session manageable. We can ask several volunteers to take part in that first comparison.