Most jeans will not show a thong. However, some light colored jeans may show the thong.
It is unlikely that you can tell if someone is wearing a thong under gray sweatpants, or that you can see the thong through those pants. If the sweatpants were very fitted, it is possible that you could see a trace of the thong through the pants.
If you can see them through your wedding dress, then no.
The sexiest thong is a matter of opinion. Many people would think that the sexiest thong would be one made out of lace and other see-through materials.
You can see the thong of the day at the website Thong of the Day. Everyday they post a new picture of someone wearing a thong and you can see pictures of previous days.
The best bet is usually to just get a thong since that wont ride up or show through jeans. Just make sure that that thong is exactly your size. If it is too small it will pinch your hip and show a weird pucker line through tight jeans. If the thong is too big then it will always ride up, which you don't want. To avoid showing through jeans it is all about the size. Size 5 is small, 6 is medium, 7 is large (4 is extra small, and 8 is extra large). Since you usually can't try undies on just remember that if you are below a size zero you want a 4, size zero to four means you need a five, etc. Victoria Secret's website provides really good sizing charts for this. If you don't want to wear a thong, then follow all the instructions above, but get a full coverage mesh panty.
who?
wear super low rise jeans and wear a thong that is a size smaller...it should ride up prety good
No you shouldn't be able to tell unless it is bulky or jeans too tight
For girls, it'll deffanetly make you feel hot & sexy. If you bend over in jeans or sweats and your thong hangs out a little, it's defanetly hot for guys to see! I enjoy pulling up my thong in the back just a little, it really turns guys on.
A 13-year-old boy should not wear a thong. Instead, he can try wearing boxer briefs or briefs with his skinny jeans to avoid bunching up. Look for styles that fit snugly and have a low profile to minimize visibility under the jeans.
The white Levi's Men's 501 Jeans are made of white denim, so you can't see through them at all.
It's a thong with poop in it. If the poop goes through the thong, then its still a poopthong no matter what. But don't poop in your thong! Because, I know someone who did. It looks discusting! And it smells really bad.