I usually buy online as they have good return policies in most online stores that if they don't fit you can send them back. I do this as the range of swimwear that is available in Sweden is very limited so if you want something more interesting you can either go on vacation to buy something or buy online. I think poka dots are nice and are in this summer as are red stripes and black stripes.
umm usually in March or April I'll go.. just depends on the sales and who's having them.. typically I'll go to JCPenny's, Sears, or Target.. I don't know we have a lot of smaller clothing stores so I might find something different.. this is the 1st year I'm wearing a bikini (or planning on).. so I'm pretty excited... but I like blues usually bright ones.. not super dark shades.