|Viking is easy and comfy. And if you can draw a straight line with a ruler, you too can make yourself a Viking apron and tunic. There's certainly classier photos out there, but this is me (taken by Mistress Elizabet Mackenzie du Ross).|
This is the pattern that I used for the last apron.
Vigdis' site is another good one (unfortunately the site is no longer extant except via the wayback machine!
This page pastes (with attribution, thankfully) several other pages into one. Note that the first URL given (http://bjornsson.crosswinds.net/sca/isabel_as/womens-garb/womensgarb.htm) is now defunct, but the article in question has been combined with men’s garb and is available from the WayBack Machine (here).
There are also 2 Facebook groups: Vikings in the SCA and Viking Clothing
There are 2 books – one by Thor Ewing (at Amazon) and the other by Nille Glaesel (also at Amazon). There’s a PDF of some of the patterns online.
Cathy Raymond’s blog has quite a bit of Viking stuff on it as well.
An in-depth summary of the archaelogy on the apron and the tunic are also available.
Sunnifa’s Viking Age Clothing Class Handout comes in several parts. She also has several other good handouts. Click on the "Projects -> Sunnifa's Projects" link to see them.
For the tunic – there’s a lot of variations on a theme ...
The potential variations are summarized here and here (this is a good archaelogical summary, and he does the same thing for shoes).
This is basically how I make my tunics. Which is pretty much the same as this