It was about 2 years ago that I made my first long sleeve version of the Lucy. I shared the file for the long sleeve add on in that post. Since kids never stop growing Penny out grew her Lucy and I decided to make another long sleeve version only for my knit obsessed little girl I made this one as a sweatshirt. 
I combined my favorite elements of the Lucy with my favorite elements of the Ringo Raglan (mainly because that was the pattern laying on the table next to me) 
To make this pattern hack, I made the Lucy following the directions. I lined this one with the super soft double brushed poly from Raspberry creek fabrics. (they are sold out of this particular print but they have lots of other options) The only change I made in sewing together the Lucy was leaving the neckline open instead of sewing the two layers together along the neck. This made turning it right side out really easy too. Then overlapped and lined up the front and basted them together at the neck. Then I added the cowl from the Ringo Raglan to the neckline. It fit well in place stretching slightly to fit. This does make it so the Lucy is no longer reversible (since I didn’t take the time to finish the inside seam nicely but you could) 
Then I added cuffs to finish off the sleeve. I used the cuffs from the Ringo Raglan pattern as well. 
The final touch was sewing on the buttons. I just sewed them in place skipping button holes since they are for looks not function. It was so easy and they add a cute look.
Here are the patterns I used. Also good news there are women’s versions as well! You would need to lengthen the sleeve for the womens pattern since I don’t have a long sleeve add on but you could use the Ringo Raglan sleeve length as a guide for that.
Girls Version
Womens Version