Men's clothes and shoes?

So my husband is 6'9" and has GIANT feet and LONG legs, I'm wanting to order him some nicer pants for us to workout together and some shoes as well but my problem is that I dont know where to look for stuff his size. His pants are typically 38x42 if we can find them so he needs length and his shoes are 16.5-18 depending in the brand. I know I always see posts suggesting places for plus size and tall women, can I get some for men?

Picture of his pair of shoes I just ordered hoping they will fit (sorry I look like a potato, I've been quarantined with 2 toddlers and a breastfeeding baby for a month 😅)