"Where can I find long tunic length shirts to wear with jeans/leggings?" Tunics can be hard to come by! Many people do not know the right length shirt to wear with leggings, and what should be covered, etc. When you are wearing leggings, you want to find a flowy (NOT tight!) tunic that covers your behind. I have always had lots of success finding these types of tops at Nordstrom.
Here is an example of a “high-low” tunic top, which falls slightly higher in the front, and longer in the back to make sure you’ve got your booty covered! And as a bonus, it is from Nordstrom Junior’s Department at a steal of $38! You could easily pair a long patterned cardigan over this as well.
Another great thing to wear with leggings/dark skinny jeans is a chambray tunic. This denim-like shirt is great for matching patterns, and throwing on for a classic look. Here is an example:
I personally have this chambray boyfriend shirt from Nordstrom, and LOVE it! It is the perfect length for leggings, and I often pair it with boots, booties, or ballet flats. Leopard print & corals also compliment this tunic perfectly.