I don't buy a lot of fancy under things and I prefer comfort over look any day. In my life I have tried many different styles and types of underwear and my current favorite undies are my cotton bikinis from Victoria's Secret.
Victoria's Secret makes bikinis in a few different styles but the ones I like are either the string bikinis or the regular plain style of bikini. They are both made of 100% cotton except for the waistband so they are soft and breathable. They come in several patterns and colors and the best feature of all is that they are tagless so there is nothing to stick out or scratch you. Both styles come with thin, flat elastic waist bands so they fit well under clothing and they have the Victoria's Secret name around the top band. They both fit really well and stay put without riding up but to me the string bikinis are a little more comfortable and are not as snug in the leg areas. The string bikinis also look a little sexier then the plain bikinis. Both styles last a really long time and I have several pairs that are getting up there in age (as a lady I won't go into more detail about that) and they have not stretched out at all and have no holes or tears.
I am extremely cheap so it is hard for me to spend the $7.50 that these are normally priced at and not go to Wal-mart and buy a bag of undies for under ten bucks but I discovered a little secret about shopping at Victoria's. At least once a year they run a huge sale on theseunderwear and you can actually get 10 pairs of them for $25.00. That brings each pair down to only $2.50 each and for that price they are well worth it. Be ready to get in there and fight for them though because when they are on sale the tables they are on areswarmed with shoppers all digging for their sizes. I avoid the crowd though and send my husband in to get them and I wait outside with my son.