Laura is one of the best pattern makers ever. All Titchy Threads patterns are great. The instructions are clear and easy to follow, if you are a beginner you will certainly be able to sew a pair (it's a good one to start if you are afraid of knits). It goes from 0-3 months to 10 years. Regarding this pattern I only have one thing to comment, it runs to small for my taste, I like the leggings to fit perfectly to the legs but not so tight. I always make 2 sizes larger on the width with the waistband and height on the correct size (personal taste comment)
You might find this review a little shorter than the others, but Laura's Patterns are flawless, so there's not much to say...
I've only used it for pyjamas, but this is a great pattern for outdoor leggings too!
with Rowan Tee
with Rowan TeePattern:
Pants: Fancy Pants Leggings, by Titchy Threads
Shirt: Rowan Tee & Raglan Tee, both by Titchy Threads