The depth of a queen fitted sheet can vary depending on the specific sheet set and brand. However, the standard depth of a queen fitted sheet is around 15 inches, which should fit most mattresses with a depth of up to 14 inches. If you have a thicker mattress, you may want to look for a sheet set with a deeper pocket depth to ensure a secure fit.

As for matching pillowcases, many sheet sets include pillowcases that match the sheets. However, this can also depend on the specific set and brand. Be sure to read the product description or check the packaging to confirm if the sheet set includes matching pillowcases. If not, you can often purchase matching pillowcases separately or mix and match with solid-colored pillowcases to coordinate with the sheets.