342. As regards the form of sacred vestments, Conferences of Bishops may determine and propose to the Apostolic See adaptations that correspond to the needs and the usages of the individual regions.[cf. Sacrosanctum Concilium 128]
Since albs and chasubles are not really described in these pages, I suppose and white undervestment and any appropriate over-garment would suffice. There are a wide variety of forms of traditional chasubles between the apron-like fiddlebacks and the rain ponchos. Anything in between goes, right?
343. For making sacred vestments, in addition to traditional materials, natural fabrics proper to each region may be used, and also artificial fabrics that are in keeping with the dignity of the sacred action and the sacred person. The Conference of Bishops will be the judge of this matter.[cf. Sacrosanctum Concilium 128]
And alas, we have the polyester privilege. Most often though, vestments can be a blend of both.