Best pants for tall 4 year old

I need advice on the best patterns to use for my daughter's pants. She is tall and slender- probably a 3 width and 5/6 length. She prefers no button or real fly on the front of her pants and isn't too picky beyond that. I have the following patterns: -sandbox (up to 3T) -field trip (up to 4t) -art museum (up to 4t) -after school (5t-12) Any thoughts on which of those four is the best starting point to get a nice, slender fit? I've made the playtime leggings and will make the nature walk pants and feel relatively confident in my ability to adjust them to her size. I just need advice for twill/denim/corduroy type pants. Thank you!!