I picked up some cheap jersey for £1 a piece at the market a while back with the idea of making some t-shirts, two of the pieces are stripey, but I also have some denim style jersey so I could attempt legging/trouser things. But lets start simple with a home made t-shirt. I drew around a t-shirt by sister bought me for christmas that has a really nice fit to make my pattern.
With stripey fabric it was really important to make sure the stripes matched up between the front and back. I cut the front pattern piece out of the fold, so after folding the fabric over and I made sure the stripes matched up and pinned it in place before pinning the pattern piece on top. Then I cut out the front piece. For the back I did the same- folded the fabric over, matched the stripes, then pinned to keep in place But I also checked on which colour stripe the armsicle (armhole, technical term would you believe?) landed and made sure the back pattern piece did likewise.
I decided to do the stripes vertical for the sleeves, to add a quirky touch and it meant I didn't need to line up the sleeves to the top. (As you will see the direction of the stripes on the sleeves depends on whether your arms are down by your sides of outstretched, so I didn't really need to worry about the stripe direction too much).
The next step was to sew the front piece to the back piece- wrong sides together natch- carefully lining up the stripes again. The fabric is jersey which has some stretch to it so I used a zig zag stitch which will stretch as the fabric does. Sewing the sides is fairly simple but sleeves can be tricky. Luckily for once I had faithfully traced the original t-shirt sleeves so my sleeve pieces were the correct size to fit to my sleeve holes. To attach the sleeves I turned them the right way round (with the top turned the wrong way round) and put then inside the top, lining up the edge of the sleeve with the edge of the armsicle and sewing around the edge.
I think it came out pretty good, I left the edges around the neck and bottom raw because I thought trying to sew it up would likely lead to disaster. I think it has a nice casual feel and a good fit.