Can I wear this dress to a wedding?

[stmw123]

My DP's best man, weddings in June. It looks acceptable to me in the pic of it hung up but the picture of it on the girl looks quite light.

Don't want to look too bridesmaidy or wear something that looks a bit too close to white.

Struggling to find anything I like😩

If its a big traditional wedding with the bride in full on bridal gown its absolutely fine. I personally have never been to a big wedding where a dress like that could be remotely thought of as upstaging the bride, as its just a dressy but 'ordinary' dress. So unless its the same colour as the bridesmaids id wear it.