I thought that a tunic would be really nice for this ensemble

The pants are kept up with garter stitch suspenders/braces and the front is buttoned with small heart buttons.

A sneak peek at the pattern ...

Pants
Cast on 88 sts in pink and knit 1 row. Change to lilac and knit 2 rows ga, change to pink and knit 2 rows ga. Change to lilac and knit the sts onto 4 double pointed ndls or a cirdular ndl and continue knitting in the round. Knit 2 rows st st before knitting pattern B (See pattern). Continue knitting 2 rows st st. On next row increase 8 sts evenly across row = 96 sts in total. Continue knitting st st until work meausres 7 cm. Place a marker for center back and center front. Begin row from marker back and knit the pants back longer like this: K20, turn, purl 40 sts, turn, k30, turn, purl 20 sts back. Continue knitting st st over all sts ...

A sneak peek at the pattern ...

Short-sleeved sweter in stripes
Cast on 80 sts in pink and knit 9 rows ga. Continue knitting st st and knit the sts onto 4 double pointed ndls or a circular ndl and continue knitting in the round. On next row increase 8 sts evenly across the row = 88 sts in total. Continue knitting stripes, 2 rows pink, 2 rows lilac alternatively until work measures approc 9 cm. On next row do the following decreases for the armholes: Cast off 3 sts, k38, cast off 6 sts, k38, cast off 3 sts. Put work aside and knit the sleeves.
Sleeves: Cast on 40 sts in pink and knit 1 row. Change to lilac and knit 2 rows ga. Change to pink and knit 2 rows ga, 2 rows st st. Continue knitting 2 rows lilac, 2 rows pink alternatively 6 rows altog. On next row cast off 3 sts at the beginning of the next 2 rows. Take care that the stripes end the same way on the sweater and on the sleeves. Knit the sleeves onto 1 ndl like this. 1st sleeve, front, 2nd sleeve, back.
Continue knitting 2 rows  ...

Cap
Cast on 72 sts in pink for American Girl doll ( 80 sts for Baby boll) and knit 1 row. Change to lilac and knit 2 rows ga. Change to pink and knit 2 rows ga. Change to lilac and knit the sts onto 4 double pointed ndls or a circular ndl. Knit 2 rows st st in lilac before knitting pattern A (See diagram) Continue knitting st st in lilac until work measures 11 cm. On next row knit a row of eyelets, k2tog, yon  ...

Finally we needed a pair of socks. They are knitted in lilac and pink stripes.

I know that you will like these clothes.  Enjoy your knitting! 

Regards

Målfrid