For a light blue Eid dress, a common fabric choice would be a lightweight, breathable material like cotton or chiffon. These fabrics are comfortable and suitable for warmer weather, which is typical during the Eid holidays.

Some other options that could work well for a light blue Eid dress include:

- Cotton lawn - A very fine, lightweight cotton that drapes nicely.
- Georgette - A sheer, crisp fabric with a slight sheen.
- Organza - A delicate, semi-sheer fabric that adds a bit of structure.
- Crepe - A lightweight, slightly textured fabric that flows well.

The choice would depend on the desired look and feel of the dress - something light and airy is often preferable for Eid celebrations. Matching the fabric to the dress design and personal style preferences would help ensure a comfortable and stylish light blue Eid outfit.