Interesting liturgical images from Seville, Spain

I came across two rather interesting liturgical images that come from Seville, Spain. In the case of the first photo, you will note that the (quite young) acolytes and thurifer are wearing apparelled alb, possibly amices, and they are also in tunicles.

In the second photo, you can see some of this in action in the context of a Palm Sunday procession in Seville:



I haven't had time to put much research into this yet, but I know we have readers from the region of Seville. If they or anyone else has any historical and liturgical insight to offer, please feel free.