Difficulty: 
Time-Consuming:
Here is a fairly simple 3-quarter sleeve pullover to which I added a series of vertical stripes in a lace stitch. The lace stripe is fairly simple, so the number and position of each lace stripe is up to the knitter.
I made this pattern in only one size (as I selfishly made it for me!), which is about a woman's 5-6 (US sizes), or a small-medium. The measurements are shown along with the pieces which make the complete pattern.
For this project, I used #4 medium-worsted wool (182m/100g), 5.5mm needles and a tapestry needle to stitch up the pieces upon completion.
Abbreviations Used in Pattern:
Sts = stitches
K = knit (k4 = knit 4 stitches)
P = purl (p4 = purl 4 stitches)
YO = Yarn over: bring yarn around needle so that it will be knit / purled as a new stitch on the next row.
K2tog = knit 2 stitches together.
P2tog = purl 2 stitches together.
P2togtbl = purl 2 together through the back of the loop.
skpsso = slip one stitch, knit one stitch, then pass slip stitch over (with the left-hand needle, take the previously slipped stitch off the right needle and pull it over the stitch knit after it was passed, as though it were being cast off).
B.N. = refers to stitches before neck hole.
A.N. = refers to stitches after neck hole.
Knitting the Pullover...
Front Piece:
Cast on 60 sts.
Rows 1-15: *k1, p1, repeat from *.
Row 16: P2, p1, make one stitch (purlwise), p5, make 1 stitch (purlwise), p to last 7 sts, make 1 stitch (purlwise), p5, make 1 stitch (purlwise), p2.
Row 17: Knit. At the same time, begin creating the lace-stitch stripes where desired, and continue to incorporate the lace stripe stitches on all front side (knit) rows.
To Create the Lace Stripes...
The image below shows a small portion of rows 17 to 23 of the front (or back) piece, showing simply two lace stripes. For my pullover, I did at least 5 stripes across each of the front and back piece, increasing the number of stitches between each stripe from right to left
Rows 18, 20, 22: Purl
Rows 19, 21, 23: Knit (with lace stripes)
Row 24 (Increase Row): P2, make one stitch (purlwise), p to last 2 sts, make one stitch (purlwise), p2.
Continue with knit and purl rows, doing 1 increase row (purl/reverse side) every 8 rows. Do this until row has 72 sts. Be sure to follow the final increase row with the 7 more knit and purl rows.
Next, do 10 more rows (knit front-side, incorporating lace stripes, purl reverse-side) without increase.
Next row (Decrease Row): P2, p2togtbl, p to last 4, p2tog, p2.
Do decrease row every 8 rows until row has 64 sts. Be sure to follow the final decrease row with the 7 more rows.
Next, do 10 more rows (knit front-side, incorporating lace stripes, purl reverse-side) without decrease.
Do the next row as an increase row, followed by 9 more rows (knit front-side, incorporating lace stripes, purl reverse-side).
Next, do another increase row, followed by 5 more rows (knit front-side, incorporating lace stripes, purl reverse-side).
Now, starting on the reverse (purled) side, it is time to shape the arm holes:
Purl and bind off the first 5 sts, purl to end.
Next row (front side): Knit and bind off the first 5 sts, k to end.
Next row: Purl and bind off the first 2 sts, Purl to end.
Next row: Knit and bind off the first 2 sts, knit to end.
Begin to shape the neck hole at the same time:
Row i): P1, p2togtbl, p18, purl and bind off next sts until 21 sts are left on that side of the neck hole, purl to last 3 sts, p2tog, p1.
Row ii) (front side), Stitches before neck hole (B.N.): knit. Break yarn.
Stitches after neck hole (A.N.): (with separate yarn tail) knit.
Row iii) B.N.: p1, p2togtbl, p to last 5, (p2tog)x2, p1.
A.N.: p1, (p2togtbl)x2, p to last 3, p2tog, p1.
Repeat rows ii) and iii) two more times.
Next row, viii): same as row ii).
Row ix), B.N.: p to last 5, (p2tog)x2, p1.
A.N.: p1, (p2togtbl)x2, purl to end.
Row x), B.N. and A.N.: knit.
Rows xi) and xiii), B.N.: p to last 3, p2tog, p1.
A.N.: p1, p2togtbl, purl to end.
Rows xii) and xiv): same as row x).
Rows xv) - xx), B.N. and A.N.: Purl reverse side, knit front side.
Move knitting onto a separate needle until back piece is finished.
Back Piece:
Same as front piece, up until neck hole.
At the point where the neck hole started on the front piece: just do the same decrease stitching (p2tog stitches) for the armholes as was done on the front piece.
After last decrease row, knit on front side (still incorporating lace stitch, where applicable), and purl on reverse side 5 times.
Next row (facing purl side): p9, p and bind off to last 9 sts, purl.
Next row (shaping neck hole): k6, skpsso, k1. Break yarn.
A.N.: (with a separate yarn tail) k1, k2tog, knit.
Next row, Before and after neck hole.: purl
Next row, B.N.: k5, skpsso, k1
A.N.: k1, k2tog, knit.
Next, merge remaining stitches from back and front piece onto one needle for each shoulder, so that the stitches are interlocking, and bind off each shoulder.
Sleeve:
Cast on 36 sts.
Rows 1-6: *k1, p1, repeat from * to end of row.
Row 7: knit. At the same time, begin to incorporate lace stripes where desired, and continue to do so for front side rows.
Rows 8 - 11: continue to purl on reverse side and knit on front side.
Row 12 (increase row): p2, make one stitch (purlwise), p to last 2, make one stitch (purlwise), p2.
Continue to knit (while incorporating lace stitch, of course) front side and purl reverse side, doing 1 increase row (purl/reverse side) every 10 rows. Do this until row has 48 sts. Be sure to follow the final increase row with the 9 more rows.
Next, bind off the first 4 sts of the next 2 rows.
For the next 6 rows: each purl side row is done as follows: p2, p2togtbl, p to last 4, p2tog, p2.
Each knit side row is knit, with the lace stripes, where applicable.
For the next 12 rows: each purl side row is done as follows: p2, p2togtbl, p to last 4, p2tog, p2.
Each knit side row is done as follows: k2, k2tog, k to last 4, skpsso, k2.
bind off the 6 remaining stitches.
Now, using a tapestry needle, sew all the pieces together.
