OP, here. Thank you, everyone, for sharing your thoughts and experiences.
When we bought the pink and purple snowsuit, we were under a time crunch because we'd been caught unprepared by an early cold snap. I remember looking at the racks of very-pink-and-flowery and very-blue-and-car-heavy snowsuits and being annoyed that there was no yellow option. :) Possibly we lack a variety of brands in Canada, but in general, I find baby/kid clothing to fall very heavily into the glitter-and-pink-hearts or dinosaurs-and-construction-equipment pattern camps, with no in between.
In our part of Canada (and depending on how robust you are!), you might be wearing your winter coat starting in October, through to early May.
This has been an odd episode, in general. DS has been wearing the pink and purple snowsuit jacket for almost two weeks, already. DH has dressed him in it a dozen times without comment. He dresses him in pink and frilly hand-me-downs at home (whatever is handy and clean!), ignores his parents' regular has hints that DS needs a haircut (they never did this with DD), and really liked the name we decided on (which is much more often used for a girl). The frugality aspect is odd, too. DH does plenty of stuff for practicality and frugality that is counter to the norms around him. Strange that this mattered so much to him.
I am definitely the default parent and DH acknowledged that his request was additional work for me. However, I'm at home, job-searching (both kids in daycare), and definitely not spending 40 30 20 hours every week on that, so it's fair that I'm doing more household and parenting work. The joys of having a stache. :)
In the end, I asked a friend in my parenting community if she still had her son's old snowsuit, and she did (and it fits). I'm going to insist on paying for it, because she would have otherwise sold it (and I'll try to sell it when we're done using it, so this will be mostly cost-neutral). I had bought a snowsuit for DS on clearance in the spring, but he didn't grow nearly as much as I predicted over the summer.
I never even thought to dye it but it's a great suggestion! I'll keep that in mind for DD's old clothes, going forward.
Thanks, everyone!