Ikrimah (may Allah have mercy on him) narrates from Sayyiduna Ibn Abbas (may Allah be pleased with him) that the guardian may put his hand in along with the orphans' hands (that is, take from their wealth according to what is customary and needed), but he should not wear a turban or anything beyond that.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10997