You look really cute in both pictures!
I have the same arms, as well as most females in my family.
You should check out Justice, they have really cute dresses (I'm size Plus 24).
Check this dress out. I think this one would look great on you.
https://www.shopjustice.com/cold-shoulder-scuba-dress/prd-8340524?plus=true#color/619 I have one just like it, but with a unicorn.
And for color leggings, check out Fabkids, the XXL leggings fit perfectly.
You can buy four pairs for like $30.00.
If you buy that dress, get some light pink leggings.
Also, get some spegett strap sports bras. Fruit of the loom makes some really good ones.
I'm wondering if you have AIS, as your bone structure looks like a girl's. And to me, you already look like a girl.