Rupali is an online store that sells really inexpensive Asian clothing. As well as the usual shalwar kameez and and sarees, they also stock full-length
kaftans which would substitute perfectly for abayas or jalabiyas. You need to get in touch with them directly to find out the lengths of the garments. A few of them also come with a matching dupatta which you could use as a hijab, and what's more is that their prices start at just £12:
