Not enough time to change from work/school before heading off to a trendy event? I've had a few instances where I would end work at 5 and need to be somewhere by 6. Add in travel time, and that's not a bunch of time to get ready. I also have a pet peeve of changing in a washroom. The chance of my dress touching something in a cramped stall? No thanks.
So instead of changing, I've been simply modifying my outfit from casual to classy with a few piece adjustments in seconds.
In the day: Blazers definitely help give a more professional look with its cut and coverage. Likewise, a cardigan can make an outfit more casual, especially with colourful daytime tones. Also, be minimalistic with accessories. And make sure that your awesome heels are still work/school appropriate- classic pumps and wedges would suffice.
In the night: Take away the daytime pieces, add on some bling, and you're ready for a night out on the town. Extra touches of makeup (smokey eyes, red lips, etc.) are also going to make the night look.
One aspect that has me on the fence is what to do with your hair. It's probably a personal preference thing since both hair up and hair down can be a casual and classy statement. What's your opinion on this?