What's better: dressing to look super sexy or dressing to look presentable..?

People should definitely at least appear neat and clean for clinics, dressed up for shows. After all, you're not just representing yourself, you're representing your barn and trainer as well. Most barns that I have ridden at have had a basic dress code, both to make the rider more comfortable and to make the barn look good should someone arrive to watch a lesson to decide if they want to take lessons, board, etc. Paying attention to your appearance as well as your horse shows that you care and are serious about your reputation.

Really, I don't want to walk into a lesson to see middle-aged women doing a sitting trot in spaghetti straps and no bra. As for "wear what you want, the horse doesn't care," you'll be caring a lot more when that nasty little pony sneaks a bite at exposed skin. Everyone gets dirty doing barn work, but it's not that hard to dust yourself and your clothes off and wipe the horse boogers off your face when someone comes in to look at the place.

And if you get sweaty and gross during the day, throw on a hat and use a spare rag to wipe down when you have a chance.

I agree that no matter how you choose to dress you should do your best to look neat and presentable, especially for clinics, schooling at shows and trying out horses. No matter if you are wearing jeans and a t-shirt or more formal attire you should try to make sure that you don't look sloppy. That doesn't mean you have to wear certain things, you should just do as you suggested "make sure my boots are clean and sparkling, my clothes are all clean, hair tucked neatly into my helmet, etc" that isn't hard.

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