[S] Sims wearing cold weather outfit every time game loads

I have the same issue.

I saved the game while the kids made their homework. Restarted the game then- both boys are in their winter clothes. Very annoying.
They also don't change back when they are going from outside back into the house.

PC, never mods or cc

Mine are wearing their formal clothing sometimes when I log in. 

Recently for me as well. Only its mainly they don't change into "indoor clothes" when they come back in. 

Platform: Windows PC [playing through the EA app]
No mods/CC.

All EPs, Sps, gamepacks and kits.

I just started having this issue, too, but it isn't related to sims having a baby. It just started happening. I do not like it.

I started noticing this in my game too after my sims had a baby.  It started with the baby always being cold.  I checked to see if I was missing walls or ceilings.  I got a thermostat and turned on the heat.  They're in spring now and still keep reverting back to their winter wear.

It’s not just loading the game, but also switching between households. It’s currently spring in my game, and the thermostat is set to ‘hot’, and yet my sims are wearing their cold weather outfits.

This is happening to me too! Has been for ages!

Game version: 1.117.244.1020.DX11
Platform: Windows PC [playing through the EA app]
No mods/CC.