42mm band on a 38mm apple watch

Any 38mm or 42mm Apple Watch band will fit an Apple Watch of the same case size.

Different styles of band may have different lengths, so you may wish to either:

• Measure your wrist circumference to check whether your chosen band will fit before buying:

  In the Apple Online Store, on the product page for any given watch band, see under Product Information > Overview.

• Or try on the band at an Apple Retail Store.

How to change bands:

Change your Apple Watch band - Apple Support

You're welcome!