Craft Lovers ♥ Lu’s challenges and her oversize seamless reversible jumper knitted with a super ball of Big to Knit

Nothing is impossible for Lucía Ruiz de Aguirre. A surprising Craft Lover, with an endless creativity and contagious energy. An all-rounder when it comes to knitting! On her blog ‘Los Retos de Lu’ (Lu’s Challenges in English), what seems complicated, is transformed into something simple. Because of this, we’re sure that you’re going to get hooked on her Inside Out (Side In) Jumper pattern knitted with our super ball of Katia Big to Knit. Follow the step-by-step instructions to knit your oversize seamless reversible jumper using circular needles… Get ready for this great challenge and discover the great woman behind this great design.


Los Retos de Lu

My name is Lucia and I like challenges. I’m from Toledo, but live in A Coruña in northern Spain where I came to study architecture -my first challenge- and I stayed out of love. I consider myself to be a restless spirit and also the queen of organisation. I’m passionate about social networks, stamp collecting, photography, shoes and cooking.

Being a clothing designer was my second challenge. Thanks to my brand Peka’s World, there were numerous collections, a prize for Best Fashion Creator, fashion shows, showrooms… Afterwards I opened Como Molo, the first craft centre in my town dedicated to DIY, and that’s how I started the marvellous challenge of teaching other people. My last challenges are called MöU, a small collection of bags which I feel very proud of, and Möu dolls, surgery and more, dedicated to the ‘surgery’ of Blythe dolls. 

Of course, I also like to propose challenges to knitters on social networks. This gave rise to Los Retos de Lu and the hashtag #retofinde on Instagram: every weekend you learn something new, we knit a common project together and link up to create friendships. Thanks to Los Retos de Lu I’ve discovered that I’m capable of inspiring many people all over the world…

Inside out (side in) Jumper

 Design by Lucía Ruiz de Aguirre

This jumper is an easy project without any seams. It is knitted integrally with circular needles which include a cable. The jumper is started at the back; the neckline opening is worked, then the front, and finally after knitting a space big enough to make the armhole openings, the body is knitted in one piece.

The jumper is one size due to it being oversize, and spans all sizes from approximately 6 – 16 (U.K. sizing). The seamless design means that the jumper is reversible, so it can be worn with either the right side or the wrong side on the outside.


Previous notions

To knit this jumper you need to know how to knit in the round with circular needles, knit st, purl st, provisional cast on and picking up stitches along knitted edges.

Gauge. 12 sts & 19 rows = 4×4″ (10x10cm)

Materials. One ball of Big to Knit from KatiaA length of left over yarn which is similar to the yarn we are going to knit the jumper with, or a length of yarn from the same ball of yarn, for the provisional cast on. Size 10 ½ or 10 ¾ (U.S.)/(6.5 or 7 mm) interchangeable circular needles with a 39 3/8″ (100 cm) long cable, or those which are most comfortable to knit with.


  • K > Knit.
  • P > Purl.

Cast on instructions

Using the provisional cast on method, cast on 75 sts.

*How to do this cast on method: using a crochet hook the same size or bigger than the one we are going to use to knit the jumper with, and with the left of a length of yarn which is similar to (or the same as) the one we are going to use to knit with, chain 80 chain sts. Then pick up the sides of each chain st one by one and slip them onto the knitting needle until there are a total of 75 sts on the knitting needles.

You can also cast on using the traditional method using the leftover length of yarn. Then knit the first row with the yarn we are going to use to knit the jumper with.

The point being that we can then use the stitches of the first row to knit the jumper in the round (=circular).

Yoke (in rows going back and forth)

Row 1: *K1, P1*, repeat from * to * until the end of the row.

Row 2: work all sts as they present themselves.

Important: it is recommendable to pass a length of yarn through all the sts on the first row so that it is easy to pick them up without problems once the provisional cast on start has been dismantled.

Rows 3 to 12: repeat rows 1 & 2, 10 more times (=ribbing).

Row 13: work 24 sts as they present themselves, bind off 27 sts (=start of neckline opening), work 24 sts as they present themselves up to the end of the row.

Row 14: work 24 sts as they present themselves, cast on 27 sts (=finish of neckline opening), work 24 sts as they present themselves up to the end of the row.

Rows 15 to 24: repeat rows 1 & 2, 10 more times (=ribbing).

Row 25: knit 75 sts, dismantle the provisional cast on that was done at the start of the work and knit the 75 sts.

Important: at this row we start to work in the round (=circular). It is recommendable to place a marker at the beginning of the row.



From this point the front and the back will be worked in one piece (= circular with the sides closed), and only in knit st, until the desired length less 2″ (5 cm) has been reached. The final 2″ (5 cm) will be worked in 1×1 ribbing = * K1, P1 *.


Pick up 44 sts along the side of the yoke starting at the bottom of the armhole so that the join is not visible.

Rows 1 to 3: work in the round in knit st. (Place a marker at the start of the row, so you don’t get lost).

Row 4: decrease by working K2 tog and continue working in knit until the end of the row.

Rows 5 to 16: repeat rows 1 to 4, 3 more times.

Rows 17 to 21: work in 1×1 ribbing *K1, P1*.

You can make the sleeves long by working decreases every 4 rows until the desired length. (= Less 1 5/8″ or 4 cm for the 1×1 ribbing) is reached.


*Inside out (side in) jumper by Lucía Ruiz de Aguirre R. 2016. Please do not use this pattern for lucrative ends, which implies not using it for commercial benefit by selling a garment that has been made with this pattern, or using it as a basis to give classes, or reproduce and publish it for distribution. Remember to mention the designer when posting photographs or information about the pattern. Please ensure to mention the hashtag #jerseybigtoknit when you share images of your jumper. If you have any questions or suggestions write to | | Twitter:@luymou | Instagram: @luymou | Facebook: Los Retos de Lu | Pinterest: luymou