I usually add upcoming books, as well as legal downloads as they become available, to this blog, but I know that going back to search for them can be difficult so am going to paste a few of my favorite resources for free, legal material below. When one starts out doing research it can be confusing as to which books are work the expenditure and which are not. ILL is an amazing way to get a hold of older, rare books, but sometimes the wait is very long so below there are some fantastic things you can use for free!
Pangur Press: This is the Anglo-Saxon Labratory's downloadable books and papers. Several of Penelope Walton Rogers most sought-after publications can be found here for free! http://www.aslab.co.uk/pangur-press/
Academia.edu has several "must read" authors as members:
Marianne Vedeler, who covers Viking silks as well as other textile items: https://uio.academia.edu/MarianneVedeler
Lise Bender Jorgensen has been covering Viking era textiles for decades. A few of her papers are here (including the excellent one about the pre-Viking era Lendbreen tunic): https://ntnu-no.academia.edu/LiseBenderJ%C3%B8rgensen
Dagfinn Skre recently added his volumes of work on Kaupang (which are lovely enough that you will likely want to get the hard copies even if you opt to down load them): https://uio.academia.edu/DagfinnSkre
Eva Andersson Strand has done a good deal of work concerning textile production at Viking sites and many of her papers are on Academia.edu. (I still recommend that you get her book Textile Tools for Production from Birka and Hedeby which is available at Oxbow Books.) https://ku-dk.academia.edu/EvaAnderssonStrand
Elizabeth Wincott Heckett is the author of the book Viking Age Headcoverings from Dublin (which is available in print again from Oxbow and I highly recommend this title which can be purchased here http://www.oxbowbooks.com/oxbow/viking-age-headcoverings-from-dublin.html ), but you can get her article "Irish Viking Age silks and their place in Hiberno-Norse society" by running a Google search on that title (the direct PDF download does not link well).
The entire series of Viking publications can be downloaded here. I especially recommend the issue from 2011: https://www.duo.uio.no/handle/10852/37522
The Archaeology Data Service has a number of publications online as well. You have to do some searching but there is an amazing amount of material there: http://archaeologydataservice.ac.uk/archives/
Jstor is a research site for academic institutions, but they do let you look at many articles online (up to 3 at a time) if you do not have academic access. http://www.jstor.org/
And as always, I cannot recommend Mendeley enough for storing your documents and taking notes! https://www.mendeley.com/