Rose is known for Owl jewelery and signature rings, comfy large sweater and T-shirts with animals on them. Rose is a trendsetter in her own light.
Also look to this collection for more ideas on how Rose's wardrobe is like. I go into much more depth about the clothes there ---> http://www.polyvore.com/roses_wardrobe/collection?id=983881
Lily's Wardrobe: http://www.polyvore.com/lily_potters_wardrobe/collection?id=1064386
Dominique's Wardrobe: http://www.polyvore.com/dominique_weasleys_wardrobe/collection?id=1064412
Victoire's Wardrobe: http://www.polyvore.com/victoire_weasleys_wardrobe/collection?id=1064398