I drafted a basic t-shirt pattern a while using the method from Winifred Aldrich's Metric Pattern Cutting for Women's Wear. This is a very useful and comprehensive book. The one dislike I have is that the basic blocks have quite a bit of ease built into them - perhaps the ease you would have seen in the 90s. So, it takes a little tweaking to bring it to a modern fit.
I've made numerous shirts from this pattern with different details and have continued to tweak my block.